Antique Electronics and Vintage Solid State

I collect and restore antique vacuum tube electronics (i.e. "boatanchors") and vintage solid-state gear.


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Sylvania Polymeter 134 and 134Z Manuals

Thanks to Kent Stephenson for scanning his copies of the manuals

Sylvania Electric Polymeter 134 Instr. Book 0 Cover.jpg

 for the Sylvania Polymeter Model 134 

Sylvania Electric 134Z Polymeter Operating Manual 1.jpg

and Polymeter Model 134Z

I’ve added them to my Liberated Manuals and Books archive.

Sylvania Polymeter 134 Ad Dec 1946

He also provided a

Tektronix 454A loose BNC

The mounting nut on the Channel 1 BNC connector of my Tektronix 454A was loose.

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It’s painful to get access as the channel 1 and 2 input circuitry is shielded. The screws are not Phillips; they are instead Pozidriv. …

Krohn-Hite UHR-220 Power Supply

I’ve acquired a Krohn-Hite UHR-220 high voltage power supply. Thanks Ross!

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I really like the styling on these old Krohn-Hites.

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The Jones socket offers the same voltages as the binding posts on the front panel. …

Tektronix 2213 focus repair

I was checking out my Tek 2213 scope before selling it, and noticed that the focus was fuzzy. 

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A little Duck-duck-go-ing informed me that this is a fairly common problem in this series of Tek scopes.

Probe accessories for the GR 1806-A VTVM

Over on the Antique Radio Forum, Philip Colston was asking about accessories for the RF probe of the General Radio 1806-A VTVM.

General Radio 1806A RF Probe Accessories.jpg

It turns out that the tips are identical to the accessory tips for the Tektronix P6000-series scope probes:

Ballantine Model 300-E Sensitive Electronic Voltmeter Instruction Manual

I scanned the instruction manual for the Ballantine 300-E and added it to my Liberated Manuals archive. Click the image below to download the PDF.

Ballantine 300-E

Uniden BC-50XL Scanner service manual

My old Bearcat BC-50XL scanner is showing its age. The squelch has stopped working. It’s probably bad capacitors, so I guess it’s time to build that capacitor ESR tester I’ve been designing off and on for the past decade. 

Krohn-Hite 430-AB Audio Oscillator

I recently came by a Krohn-Hite 430-AB audio oscillator. I rather enjoy Krohn-Hite’s old tube test equipment, as they make heavy use of vacuum tube op amps.

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Does anyone have a scan of a manual for the 430-AB that they could share?

Information and parts suppliers for the restoration and repair of vintage test equipment


  • 2018-06-15: updated test lead listing



V-M Model 800 Changer Restoration

With help from some folks on the Antique Radio Forum, I identified this changer as a Voice of Music model 800.

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V-M model 800 record changer

It's a 78 RPM changer with an Astatic crystal cartridge. It was installed in a Detrola radio/phono as a replacement for the original turntable or changer. …

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© Steve Byan 2011-2016