The 1625 Appreciation Thread

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Thought I would start a thread on what has become my favorite push/pull audio output tube, the 1625.
The 1625 (VT-136) is an 807 variant with a 12.6 V heater and a 7-pin base. These tubes were used as RF power amplifiers in some of the SCR-274 and AN/ARC-5 "command set" transmitters of WW2. Postwar, 1625 tubes flooded the surplus market, and were available for pennies apiece. Surplus 1625s found some commercial use, notably the use of a pair as modulator tubes in the Heathkit DX-100 amateur transmitter.
The 1625 makes a excellent audio tube in pentode operation. It is not recommended for use in ultralinear, as the screen voltage is limited to 300V. The plates can take 600V all day long. I have a pair of mono amps that uses a quad of these, and these are great sounding amps. I actually prefer the sound from these amps to my old HK Citation II.
For DIY, this has to be one of the last true bargins left in audio. Why would anyone use current production 6L6 or EL34s when these are still out there.
" Don't look back. Something may be gaining on you"

Satchel Paige
http://www.r-type.org/exhib/aaa0118.htm (Open in New Window)

Edits: 09/05/14

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Topic - The 1625 Appreciation Thread - Freo-1 16:08:35 09/05/14 (12)

Anode Clips - Triode_Kingdom 08:17:37 09/12/14 (4)

No? How About Sockets? - Triode_Kingdom 18:33:59 09/13/14 (3)

RE: No? How About Sockets? - golana 18:51:17 09/13/14 (2)

Thanks! (nt) - Triode_Kingdom 14:43:43 09/14/14 (1)

RE: Thanks! (nt) - golana 13:58:43 09/23/14 (0)

RE: The 1625 Appreciation Thread - truep 10:01:32 09/06/14 (0)

RE: The 1625 Appreciation Thread - sony6060 06:28:59 09/06/14 (1)

RE: The 1625 Appreciation Thread - Freo-1 09:35:00 09/06/14 (0)

RE: The 1625 Appreciation Thread - Alex Kitic 03:28:27 09/06/14 (1)

RE: The 1625 Appreciation Thread - BofService 09:16:11 09/14/14 (0)

RE: The 1625 Appreciation Thread - Eli Duttman 17:46:53 09/05/14 (0)

I get 12 solid watts triode wired 807 using Fisher 500C Xformers...excellent tubenT - Cleantimestream 16:40:00 09/05/14 (0)

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