I'm new to diy tube amps and have completed 300b monoblocks with very good success. I have noticed some tubes on the net that have grid caps on the top of the tube, what kind of tubes are these generally and are any of them good for SE amps?
thanks
thanks
Those with grid caps on top are generally RF pentodes or electrometer valves. Neither are particularly useful for audio, although I'm sure someone will have used them.
You may have seen valves with anode connectors on top. These were usually intended either for radio transmitters or TV line output. People have used them successfully, but there are obvious safety issues.
You may have seen valves with anode connectors on top. These were usually intended either for radio transmitters or TV line output. People have used them successfully, but there are obvious safety issues.
2C22/7193 has TWO top caps per tube! I use them in my preamp and they sound great - specs like a 6J5 or 1/2 6SN7. Very cool looking, too.
7193 @ The National Valve Museum
7193 @ The National Valve Museum
2Ж27Л, 2П27Л, 2П29Л, 4Ж1Л, 4П1Л, 10Ж1Л, 10Ж3Л, 12Ж1Л, 12Ж3Л, 12П17Л, ГУ-50, they look very seriously. It is a modified version of Telefunken tubes designed for mobile military equipment.
Sockets look cool as well:
Sockets look cool as well:
For grid cap small signal tubes - the WE 310A, the EF37 and venerable 6C6 come to mind.
My first SE amp that I built was based on an old RCA manual - 6C6 driver, 2A3 output. It had a very nice sound with my then Stephens 12" Coax speakers in a DIY Ultraflex enclosure.
My first SE amp that I built was based on an old RCA manual - 6C6 driver, 2A3 output. It had a very nice sound with my then Stephens 12" Coax speakers in a DIY Ultraflex enclosure.
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