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45 SET Stereo Amplifier
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Author:  David McGown [ October 17th, 2019, 8:10 am ]
Post subject:  45 SET Stereo Amplifier
For Sale, a 45 SET Amplifier based on the Gordon Rankin "Bugle" circuit.
2W output. Perfect for super high efficiency speakers (tweeter or midrange horn in multi-amp setup).

Fine working condition, just a bit dusty from storage.

12AY7 or 5751 SRPP cap coupled to the 45 output tube.
Tube Rectifier
AC heater with hum pot on the 45
All oil-cap power supply (PP in oil motor run caps)

5K/10W Electraprint output transformers.

Handmade wooden chassis.

Complete with pair of vintage GE 45. Mullard GZ34 rectifier (shown) not included, but will substitute a Sovtek or Chinese GZ34.

$500. Local pickup only.

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Author:  David McGown [ September 2nd, 2020, 9:56 am ]
Post subject:  Re: 45 SET Stereo Amplifier
Sold.
Author:  SoundMods [ September 2nd, 2020, 10:02 am ]
Post subject:  Re: 45 SET Stereo Amplifier
David McGown wrote:
Sold.

That was a buy of a lifetime!! NICE!

Here is a listing for a commercially manufactured version:

https://www.ebay.com/i/254485541545?chn ... MuEALw_wcB
Author:  David McGown [ September 2nd, 2020, 10:53 am ]
Post subject:  Re: 45 SET Stereo Amplifier
Walt,

It was sold to a friend in the DCAudioDIY community who will appreciate it. The amp you linked to uses expensive Emission Labs 45 tubes, 76 drivers, DC heaters on the 45s (current source?). More sophisticated than the simple and inexpensive Rankin based design posted in Sound Practices that I built years ago. I believe it is rather overpriced given the obvious chassis damage (or poor construction) and use of good, but not top quality output transformers (James).

David
Author:  SoundMods [ September 2nd, 2020, 11:42 am ]
Post subject:  Re: 45 SET Stereo Amplifier
David McGown wrote:
Walt,

It was sold to a friend in the DCAudioDIY community who will appreciate it. The amp you linked to uses expensive Emission Labs 45 tubes, 76 drivers, DC heaters on the 45s (current source?). More sophisticated than the simple and inexpensive Rankin based design posted in Sound Practices that I built years ago. I believe it is rather overpriced given the obvious chassis damage (or poor construction) and use of good, but not top quality output transformers (James).

David


As it turns out I got a major improvement with my Carys by upgrading to Emission Labs mesh-plate 300Bs.

It wasn't even a contest between those and my other 300Bs.

http://www.emissionlabs.com/datasheets/ ... -mesh.html

So -- at about $700 per pair for the EML 45s alone, the store bought 45 SET amps. may not be such a bad buy after all.

I am after all a vacuum-tube addict (valves). :ugeek:
Author:  David McGown [ September 2nd, 2020, 2:02 pm ]
Post subject:  Re: 45 SET Stereo Amplifier
I just did a Google search, and found the builder of the amp for sale on eBay is a custom builder (Radu Tarta) up in Norwich, Connecticut. Apparently he uses goodies like Coleman DC regulators for the filaments, and the build quality appears to be quite high. His other equipment looks very nice. Still, alot for 2W, but in the right horn-based system, it could be magic.

David
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