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Old 19th Mar 2018, 2:32 pm   #41
Join Date: Aug 2010
Location: Malvern, Worcestershire, UK.
Posts: 95
Default Re: Pre-amp for Golden ears

Well Joe,they were good for 1950'-1980's and maybe a little bit beyond? RAAF Aircraft intercoms which may be of note and were ultra reliable in Canberra and other multi crewed types where vibration was present but clear intercom was paramount.

I have nothing to show now but did make myself a few pre-amps and headphone amps a fair while back and found these near pinnacle of development valves to be an advance on many earlier B9A types.
A quick google for 6112 tubes /microphonics /pre-amplifiers will give you several hours of reading.

I found the Russian gold alloy grid 6n17B-V to be super exotic at a really good price

Last edited by VT FUSE; 19th Mar 2018 at 2:45 pm.
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Old 19th Mar 2018, 10:51 pm   #42
joebog1's Avatar
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 568
Default Re: Pre-amp for Golden ears

That is where I obtained them - RAAF!! When the airforce went digital it dumped millions of dollars worth of stuff into auctions. That's where I get my valves from. I have both pentodes and triodes in that miniature format. The photo I posted is a 5718 triode.

I will do some work using some I think and post my results. It will be good to listen to my Hi-Fi at 60,000 feet too.

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