Cool looking tubes anyone...

losacco · 29th July 2010, 06:36 PM

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

DF96 · 29th July 2010, 06:53 PM

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.

807tubenut · 29th July 2010, 06:59 PM

807
829B
811A
812A
3-500C
5867
5868

That's about all I can think of.

Magz · 30th July 2010, 03:20 AM

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

Wavebourn · 30th July 2010, 03:45 AM

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:

TheGimp · 30th July 2010, 03:58 AM

Plate caps on the other hand are a totally different matter.

kstagger · 30th July 2010, 11:55 AM

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.

29th July 2010, 06:36 PM	#1
losacco diyAudio Member Join Date: Dec 2008	Cool looking tubes anyone... 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

30th July 2010, 03:45 AM	#5
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	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: __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

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29th July 2010, 06:53 PM	#2
DF96 diyAudio Member Join Date: May 2007	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.

29th July 2010, 06:59 PM	#3
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	807 829B 811A 812A 3-500C 5867 5868 That's about all I can think of.

30th July 2010, 03:20 AM	#4
Magz diyAudio Member Join Date: Oct 2009 Location: New Jersey, USA	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

30th July 2010, 03:58 AM	#6
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	Plate caps on the other hand are a totally different matter.

30th July 2010, 11:55 AM	#7
kstagger diyAudio Member Join Date: Dec 2003 Location: Grand Rapids	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.

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