Classic Tube Audio

This is a very clean Marantz model 8B. This is now posted up for sale prior to the full restoration process. YOU can own it now by making a deposit. We are scheduling it for the “bench” workout (restoration) over the coming weeks. Just to cover a few of the areas that will be restored. Tubes installed will be either NOS (new old stock) this is for the small signal and driver tubes. The outputs will be strong testing Mullard (matched) original EL34′s with the “double O getters” and date codes Xf2 … If you know Mullards you know these are rare and very valued tubes. The under chassis work will be done as noted: several power supply electrolytics replaced, several critical coupling capacitors. power supply B+ diodes to high speed low noise types and bypassed.

The bias supply updated and improved filtering added. Critical resistors in the phase splitter circuit will be updated to low nose precision matched metal film types. The feedback circuit will be re-tuned. All tube socket solder pin points re-soldered. A full under chassis clean all pots/switches will be cleaned and lubed. The exterior will be fully cleaned and waxed. A new Marantz name logo will be affixed to the front. A new 3 lug grounded “safety” power cord installed. The amp will be run tested for 15 hours and all voltages will be trimmed to proper B+ for all circuits. Bias will be matched set for the outputs. A full bench scope power rating test and frequency sweep test will be performed and results included with completed amp to the new owner. This will certify the unit meets and exceeds all original factory specifications. Shipping safety is a priority with us so extra safe packing will be done for safe transit… now how much ? you can reserve it with a $ 1,000.00 deposit and balance due prior to shipping. Shipping and insurance will be calculated and added to balance due. NOW the selling price $ 3200.00 of course plus shipping and insurance.

This is a real value for a guaranteed performing classic Model 8B .. you have our word on it.

Thank you, the “Tubeology” Guy

Marantz 8b under side sn 8-4718

This High end tube tester with original manual and one original supplemental tube setting books is considered one of the best bench top tube testers made.

The exterior of the cabinet has some wear and some of the cloth covering has a few rips, and wear marks, the interior is in very good condition. The tube chart rolls perfectly. This tester is very good to excellent condition – the meter and knobs are in perfect condition.

• Checks mutual transconductance for tube quality test which is the most reliable test known.
• Meter has only one scale which makes it easier to read than most other Hickok testers. A multiplier switch is set rather than using several meter scales.
• Handy “Plate 2″ button allows for testing double section tubes without resetting selector switches.
• Meter and roll chart are backlit….another feature not found on most Hickok checkers. This feature really makes the tester a joy to use in darker rooms.
• #49 light bulb acts as a bias fuse to protect the sensitive bias potentiometer.
• 2 plate voltages available.
• Life Test button
• Terminals for attaching external self-bias resistor.
• Shorts and leakage are indicated on the meter rather than a less reliable neon bulb.
• Sensitive gas test
• The Model 752A has all of these sockets with the addition of 9 pin and 12 pin compactron, 10 pin decal, and both types of nuvistor sockets

752 and 752A.

These are the famous FAA testers. The 752 is a beautiful machine . The “A” model has the 9 and 12 pin compactron sockets and is more money.

The best feature of the 752′s is the dual triode test buttons-you can test both halves of a twin triode without re-setting the selectors. This is a must, if you test a lot of 12ax7′s – 12au7′s etc

The model 580 is somewhat similar to 752 but really demands a premium price
The Hickok 750, 752 and 752A are a little more costly. All these also have noise tests, and short/leakage tests too! More than one test signal is provided. The 752/752A also allows you to test both sections of a dual section tube without re-setting all the switches for that section of the tube. In addition the 752/752A does not have a short test lamp they use the main Gm meter as an ohm meter and measure leakage in ohms. The 750 uses the short lamp circuit only. All these models have only one power transformer. These do not have a separate AC line set meter so the line sag issue is more prevalent. Again good, reliable, accurate tester.

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This one is about as good as they get, almost immaculate

Admiral 275 – 5D4 American 5 tube am radio in Red. Made in 1958.

The Good:

This radio has been Restored with New Electrolytic Capacitors. All the tubes have been tested on a Hickok 533. it was completely dismantled and washed in soapy water to remove all dust, the chassis was blown off with compressed air. the outer case was buffed with auto polish to remove any surface scratches, and as you can see it is shiny. there are no cracks and all places where the chassis is screwed into the plastic are solid, and the screws are original. The power cord is in great shape. The gold foil with the stars is shiny and in good shape.

The “A” and “L” in the logo has a very small amount of the gold plating worn off.

the grill is 99% perfect, except for some slight discoloration due to age.

Price – SOLD

Admiral Model 275 - 5D4 AM Tube Radio

Rear View of the Admiral 5D4 Model 275 Plastic AM Tube Radio