Contents - Note: dates are model years not calender.


        7G605 Trans-Ocean Clipper DeLuxe 1942
	8G005(Y)(B)(T)(Z1|Z2) Trans-Oceanic Clipper 1946-1949
	6G004Y Global 1946 (Companion)
	G-500 Trans-Oceanic 1950
	H-500 Super Trans-Oceanic 1951-1953
	L-507 L-507 Meridian 1953 (Companion)
	R-520/URR 1953 (contract)
	L-600 1954
	R520A/URR  1955
	R-600 1955
	T-600 1956
	Y-600 1957
	A-600 1958
	B-600 1959-1962 
	R520B/URR??? 1958???
	Leather Cases -600 models
	Tubes of the TransOceanics


7G605 Clipper (1942)

Most distinctive almost square case with rectangular front case cover hinges down from the front & telescopic antenna rotates sideways into case. Double wavemagnet incorporates shortwave and AM wavemagnet in one piece. RadioOrgan switches are stacked vertically and knobs have plain black face with stylized "Z" imprint. Airplane (round) dial, double-ended pointer with lightning "Z" in center. Earliest units (most likely 5,000 units but may have been as many as 15,000) have Sailboat silkscreen on grill cloth (same grill cloth used on am-only portables that year). Later units - all produced in 1942 - had sailboat replaced by four engine bomber illustration

Serial numbers of three production runs are (all with "T" prefix:

847011-857010 (Oct 1941 - most likely to have sailboat grille)
860261-880560 (Jan 1942 - probably all bomber)
885261-890260 (Apr 1942 - bomber. Last radio produced by Zenith prior to war shutdown and may have all gone into a vault for private use by Zenith officials.

The earliest T/O had the same band structure as all through the G-500, AM, 49M, 31M, 25M, 19M, and 16M. There is a small square window at the lower center of the dial which will display red when on and black when off as a "battery saver". The G-500 was the last TransOceanic with this feature.

Things to watch for

The small case used on the 7G makes it one of the most difficult to work on and the wax paper capacitors were a source of trouble even when new (the Commodore recommended placing in a warm oven to remove moisture). In addition the wacemagnet assmbly is hardwired to the chassis and when removing is very easy to break off.

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8G005 Trans-Oceanic (1946-49)

Easily identified from afar by the lever release on the telescopic waverod antenna (top right rear of case), fixed handle and the eight loctal (diameter about like a 50 cent piece) tubes.

Introduced in 1946 there were two major variants - 8G005(Y) and 8G005(Y)T as above and superseded in 1947 by the 8G005(Y)TZ1 & TZ2 which replaced the 117Z6 OCTAL rectifier with its miniature equivalent, the 117Z3 (about the diameter of a dime). This tube is the furthest right in the chassis when observed from the rear and utilizes a riveted patch to the octal chassis hole for the minature tube socket.

In addition, all versions appear to have been available with an 220v adapter & switch in a separate subchassis mounted on the top of the case above the tuning condenser and next to the bandswitch tower. When so fitted, a "B" was added to the model and chassis number e.g. model 8G005YBT/chassis 8C40BT, and later 8G005BTZ1/8C40BTZ1.

The 8G chassis has six bands with the frequency markings on the selector buttons (BC, 16m, 19m, 25m, 31m, 49m).

During the model run, subtle changes were made to the band coverage on several bands so that two different silkscreens for the dials were used. The easiest way to tell is from the 6.0 Mc marking on the 49m waveband. On early models this will be above the 49M logo, on later models it will be below. See dials. There is some indication that a third dial may have been used for the Z2 chassis but has not been isolated and the following model, the G-500, used the same dial as the TZ1.

Things to watch for

Make sure that the broadcast Wavemagnet (black with embossed but almost invisible "Z") on the top cover, shortwave Wavemagnet (red with loop bar stored in back cover), suction cups (2), and cables as well as the instruction/logbook stored in a hinged over at the lower front of the case are present and in good condition. Knobs are flat with a gold band on the front of each. The 8G face has no screws on the top edge of the plastic faceplate. When ON the 8G displays a square red "flag" in a window at the lower center of the dial.

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6G004Y "Global" (1946) Companion or (rear view)

Like the later L-507 Meridian, the 1946 6G004Y Global was an attempt by Zenith to test the market for an inexpensive Transoceanic. In this case there were two: the 6G001 Universal and the 6G004 Global. Both used essentially the same chassis and tube line-up however where the Universal was BC-only, the Global had two bands - conventional 540-1600 kc BC and the oddly selected 9.5 - 12.1 Mc Shortwave band (the later L-507 had two shortwave bands and near continuous coverage).

Much smaller and lighter than the 8G005 TransOceanic, the case seen from the side has a trapezoidal section rather than rectangular and while there was sufficient room for the BC only version it is rather a tight fit when the necessary extra components for the shortwave band are added, seemingly in an erector-set like stack on top of the 2-gang tuning condenser.

The tilting telescopic antenna as was used in the 1942 7G605 TransOceanic was probably selected since there was no room for the 8G type pop-up WaveRod and even so removal of the 1LN5 RF amplifier or the 1LA6 converter tubes is very difficult (note: original 8G used a 1LC6 however the Z1 revision reverted to the 1LA6 as used by the 7G605)

The same removable WaveMagnet as used on the 8G series (they seem to be interchangable) is found on the top cover however there does not seem to be any provision for an external shortwave unit as found on the 8G

It should be noted that while the BC-only unit is generally referred to as the "Universal", both units have this logo on the left hemisphere of the faceplate (tuning dial is on the right) and it seems to have referred to the AC/DC/Battery operation capability. Further both units have the ZENITH logo with "Long Distance" underneath. on the brass center bezel. The 6G004Y has "Global" beneath that.

When closed, the two models cannot be told apart unless one knows to look for the telescopic antenna cut-out. When open the Global may be easily distinguished by the second band, the slide-switch for "Treble - Bass" on the left, another "Short W. - Std. Bc'st" on the right, and the "Global" logo on the bezel. As with the L-507, the front cover latch is circular and has "Zenith" in script on the upper hemisphere.

It has been reported that the 6G004Y had disappointing sales and was not continued into 1947 though undoubtedly dealers continued to try to unload them as long as supplies lasted. With the BC-only model already pricy (1946) at U$54.60 (less battery), there just was not room for another model between that and the U$114.40 (less battery) 8G005.

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G-500 series 1950

Outward appearance is almost identical to the 8G, but is quite different. Is first year of folding handle. Last year of the brass dial surround it has a chassis very similar to the H-500. Major differences from 8G is the five miniature tubes chassis. The case has the "late" lever-less antenna (round top) and the front logbook cavity is gone. The plastic face has the same band selection as the 8G but there are four screws along the top surface on later G-500s. Early G's used the same face as the 8G. The Wavemagnet is completely different with a bold gold Zenith emblem in a circle of gold and is held in place by two round brass thumb nuts. Chassis 5G40. Last chassis with red "power on" flag.

First Transoceanic to use the new integral 220v adapter. A three position tower that accessory that bolted onto the main chassis after removing an L-shaped cover, there were three positions: 110v ac/dc, 220vac, and 220vdc. Each position added/removed ballast resistors contained in the tower.

Things to watch for

The plastic wavemagnet has a tendancy for cracks may develop around the edges.Was last series to use wax paper capacitors. See note on 1L6 tubes.

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H-500 (May 1951-1953)


Outwardly the case is identical to the G500 however the face is completely redesigned. To some the H-500 is the most elegant of the T/Os with the gold plastic face, gray plastic speaker grill, and the last of the classic airplane style round dials. The number of bands has increased to seven with the previous 49m band being replaced by two "tropical" bands, 2-4 Mc and 4-8 Mc. The Wavemagnet is more rectangular and is gray on gray cloth with a small Zenith crest near the top center. The knobs are now black with brass centers and are interchangeable.

The H-500 used five different chassis, all of five tube design and all designated 5H40. The first is very similar to the G-500 with twin pin earphone jack & 1S5 tube while the second ("A") has a 1U5 (required rewire of the socket). The third ("B") replaces the twin lead earphone jack with a conventional 1/4 inch phone jack. The fouth unit ("C") added a "low voltage" switch for use when the line voltage was less than 110vac. And the last identified ("D") added a socket for an optional 50A1. This was probably to use a common stamping as for the R-520. All are easily separable from earlier chassis by the BC band padder adjustment located at the extreme left rear of the chassis.

"Best guess" dating the five chassis is as follows:

Baseline: introduction (May 1951)
A-revision: sometime between 20th week & 35th week 1951
B-revision: sometime between 37th week & 45th week 1951
C-revision: sometime between 12th week & 23rd week 1952
D-Revision: mid 1953 ?

Other than the "D" revision,these dates are taken from observed speaker numbers.

Note: the 1/4" phone jack on the rear of the chassis left very little clearance between it and the rear cover. At the same time the hinging mechanism made it difficult for a TransOceanic to rest properly on a table with the rear cover open. To allow earphone use with the cover closed, Zenith marketed a set of headphones with a special flat, right-angled headphone plug. This plug was also available as an adapter for early twin-lead headsets.

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L-507 (companion) 1953 or rear view.

The L-507 Meridian, while not strictly a member of the TransOceanic family, is included as representative of the "companion" models. Zenith often offered lower cost versions of their shortwave portables to try to increase market share. Since companions had disappointing sales, these are often harder to find than the more upscale TransOcenaics. This makes them rare but not necessarily valuable.

The 1953 Meridian was the second such radio produced and in bore little relationship to the 6G004 other than use of trimming capacitors for alignment rather than coils.

The Meridian is a three band protable with regular broadcast (540-1600 Kc) listed in the lower hemisphere and the two shortwave bands (2-6 Mc and 6-18Mc) shown in the upper hemisphere. The speaker (same 5.25 inch PM unit used on the TO) is behind the dial and the speaker grill is the silver section inside the dial bezel.

Band selection is via a three position switch extending from the tuning knob on the right. On/Off/volume is a knob on the left. Like the Global, the Meridian has a circular latch arrangement with "Zenith" in script on the top half. On the Meridian, the WaveMagnet is non-removable and is attached to the rear cover which is square as on a -600

The Meridian is said to have been priced at U$89.95 in comparison to the U$124.95 asked for the H-500.

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R-520/URR (1953) or rear view

Military version of the H-500. Signal Corps ID plate below latch and "USA" on front of brown oil-cloth case. Faceplate is cream/brown with color coded band selector buttons. All tubes are fitted with metal shielding, reinforcement, and 110/220v adapter (same unit was optional on tubed models starting with G-500). Glow light at upper right corner of dial provides illumination of panel. The R-520 has no relation to the R-600 though it is also a six "tube" chassis while the later (1954) R-520A may have been based on the 6L40 chassis.

Early units may not have "USA" logo. Brown oilcloth covering is sometimes mistaken for the leather cover used optionally on some 600 models. Plastic pieces are a medium brown including handle, knobs, wavemagnet, dial back plate, & waverod tip. Rear cover uses a lever catch in the center as well as the normal spring clips and has clips for a full spare tube set, fuses, wavemagnet extension cable, glow lamp, ans a recess for the instruction book.

R-520 was the first T/O to use the 50A1 ballast tube for voltage regulation and only military TransOceanics are fitted with a chassis fuse. Earphone jack is mounted on a panel next to the speaker instead of on the chassis. The recessed jack allows the rear panel to be closed with a standard 1/4" phone jack instead of the flat, right-angle plug used by Zenith on the later H-500s and L-600 model.

Standard 110v/220v ballast adapter is on right of speaker (see also R 520A/URR).

Service manual TM 11-877 issued in 1953 for the R520 is the best guide to circuits and service procedures in print for miniature-tubed TransOceanics.

Things to watch for

The major problem with the military models is that they are all rare and used many unique parts. While outwardly seeming similar to other TransOceanics, reality is quire different. For example both knobs on an R-520 are the same as the tuning knob used by a leather -600 and even though this part was actually used on a production model, few would want to cannabalize a leather TO to restore a R-520. The R520A has more in common with production units and an H-500 faceplate could be used on a R-520A if the logos were stripped and repainted the proper colors but an expert could tell the dufference in the fonts.

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L-600 (L) (1954)

First of the official "six tube" commercial chassis (the sixth tube is actually the 50A1 "constant current" regulator seen in very late H-500s and in the R-520/URR). Easily identified when closed by the Wavemagnet in the top of the cabinet rather than inside the top cover (and in a rather vulnerable position - I have seen several that have suffered from dropped cigarettes that melted the plastic cover or have been cracked I suspect by something being dropped on it with the handle folded rearward (rests on the WaveMagnet then)) and when open by the "international" or "slide rule" dial replacing the circular dial of the H-500.

Another change with the L-600 was the addition of the dial light (with momentary contact switch on the left side of the face beneath the speaker grill) and the power cord connection that included a spring-loaded takeup reel on the inside (often this has been removed/replaced with a conventional cord and lacking the special right-angle plug).

It appears that this is the only model -600 to color the entire relief with the logo "WAVEMAGNET" on the top of the Wavemagnet in gold on both the staghorn and leather versions. later units merely colored the letters.

The knobs are outwardly the same as a H-500 however only the tuning knob now may be interchanged as the off/on/volume knob has a small rectangular protrusion that covers an "on" legend on the face when turned off.

The position previously occupied by the wavemagnet is taken by a rectangular gray plastic cover housing "charts and logbook" insert. Chassis 6L40. (also available in genuine leather for U$20.00 additional. Chassis 6L41. See also "leather" note)

A model in transition, the L-600 is introduced with the smooth handle of the H-500 and lacks the later RDF pivot on the Wavemagnet. By the 14th week 1954 the handle had become ribbed however there is still no pivot hole. The earphone jack is also maintained on the rear of the chassis.

The L-600 is said to have been introduced with a single advertisment in Febuary of 1954. However I have recently acquired an L with a date stamp on the chassis of Oct 30, 1953 and a speaker date of 44th week 1953

Though I have no way to prove it I suspect that fulfillment of the contract for the R-520/URR might have delayed the public introduction of the L-600. Unfortunately, my R-250 does not appear to have a stamped-in Zenith serial number for comparison.

However there does appear to be a singular difference between the first production (1953) L-600s and later examples: the 0-100 numerals in the "logging" scale at the top of the dial are an almost illegible RED, rather than the WHITE as in all later -600 models. Nice idea that just did not work.

Things to watch for

I have seen several -600s in the past that have had the selenium rectifier and 50A1 ballast tube replaced by a silicon rectifier and an approximation of the proper resistance. Often this will dramatically raise the filament voltage of the tubes resulting in marketly shorter tube life.If the 50A1 is still present, it will glow brighter than normal. A good approximation is to use either a 220 ohm 5 watt resuistor to replace the standard 130 ohm unit tied to the Se rectifier, or to put another 100 ohm 5 watt resistor in series.

Also the plastic logs/charts cover is prone to cracking at the hinge points at the bottom. A drooping door is often caused by this.

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R-600 (L) (1955)

Almost identical to L-600 except that the earphone jack is moved from the rear of the chassis to the front panel below the right side of the speaker grill. Chassis 6R40. This enables easy attachment of a 1/4" phone jack equipped headset for private listening, however the front cover cannot be shut with a standard plug attached. Zenith sold a flat, right-angled 1/4"plug equipped headset for use with TransOceanics.

The handle has a small circular hole at its midpoint visible when in the forward position. When the WaveMagnet is removed from the case, a pivot will be revealed. Placing the pivot in the handle hole allows the Wavemagnet to be used as a Radio Direction Finder (RDF).

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R520A/URR (front) or (rear) rear GIF from TM 11-877 change 1

Second military model. Green oilcloth covering and may be based on 6L40 (L-600) chassis but has R-520 type front panel in black/gold without dial light switch or dial light. Logos are in the later fonts used on -600s. Earphone jack is mounted on a bracket by the speaker with 220v adapter on left. Slide rule dial. No dial light switch or earphone cutouts on faceplate. No separate rear cover latch. Special fused AC plug Otherwise similar to R-520/URR. Manual is TM 11-877 with Change 1 (C-1).

Note the difference between the dial and bandswitch and that of the suspected R520B is primarily in the colors while the fonts/logos are the same.

A "decontented"follow-on to the R-520, the R520A lacked some of the shielding, the plug adapters, battery adaptors, and alignment tool of the ealier unit as well as the special face, knob, and accessories coloring, uing instead the black/gold coloring of the standard TO. The only exception was the lack of a front earphone jack or diallight switch (note that the shield for the light is present on the dial).

Instead of the separate A & B batteries typically used by the R-520, the A was equipped to use only the combination A/B battery of the civilian unit.

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T-600 (L) 1956

Added radio/phono switch and RCA plug on rear so that a phonograph could use the amplifier/speaker of the T/O for play. Original chassis 6T40. Later change in power supply resulted in chassis designations of 6T40R and 6T40Z.

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Y-600 (L) 1957

No change, used 6T40Z chassis.

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A-600 (L) 1958

Second band changed from 4-8 Mc to 4-9 Mc. Last tube chassis 6A40.

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B-600 (L) 1959-1962

Last tube model, 6A40 chassis. Same as A-600. Board chassis sits on is usually white. "CSL" sticker near BC band padder adjustment.

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Leather Cases -600 Trans-Oceanics

All of the 600 series transoceanics were available with brown leather cases for a paultry $20.00 additional. The leather case went much further than just the outer cover however, nearly every plastic or painted piece was different: WaveMagnet, knobs, faceplate, logs/charts cover, handle, and even the Waverod tip. Since the backing plate for the slide-rule dial was also brown instead of black, the chassis carried a different designation making the Leather R-600 (R-600L) chassis 6R41 instead of 6R40.

People seem to either like or dislike the leather cases, there is no in between. In my opinion they are very pretty but even more difficult to restore than a black Staghorn unit since the light leather shows every blemish and since the special brown parts are very difficult to find.

Once in a while people will mention seeing a leather H-500. To the best of my knowlege the factory never produced any of these (never say never). The brown oilskin of the R520/URR does look very much like a leather 600 however and a few parts (really tuning knob only though - there are subtle differences in the faceplate for instance) are shared with them.

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