6DQ6 for audio power amp?

porkchop61 · 6th September 2010, 08:51 PM

Hi all-
I got a good haul of tubes this weekend, and had 4 of these 6DQ6 tubes. Anyone ever seen these used for audio power amplifiers? And schematics floating around?
Thanks in advance.

Glenn

One of them seems to have a tiny problem

rsumperl · 6th September 2010, 09:40 PM

Greetings from Binghamton, NY!
There are schematics floating around the Internet that use the 6DQ6's. I believe they are in the 30w range. Here is a link that might help:

6DQ6 Substitution

Ray

porkchop61 · 6th September 2010, 10:13 PM

Thanks Ray, good reading.
I should probably have mentioned Hi-Fi and not guitar amps, but the reading is still interesting.
I thought these would make a nice low powered PP stereo amp for me to play around with. I know they are a TV tube, but they should do pretty well as an audio amp tube with that type of anode rating!

Glenn

rsumperl · 6th September 2010, 10:23 PM

The "red board" uses sweep tubes and can be used as a guide. Personally I think that sweep tubes make great audio amplifiers. If I can be of any help, please feel free to email me @ rsumperl@hhk.com

Ray

jackinnj · 7th September 2010, 02:32 AM

Quote:

Originally Posted by rsumperl

The "red board" uses sweep tubes and can be used as a guide. Personally I think that sweep tubes make great audio amplifiers. If I can be of any help, please feel free to email me @ rsumperl@hhk.com

Ray

I have a warm spot in my heart for this tube as it's the first I used as a ham radio transmitter.

By "Red Board" -- do you mean: DCPP Amp

aardvarkash10 · 7th September 2010, 03:01 AM

this may help - specs for outputs between 34W and 84W using the 6DQ6-A in AB1 pp. No schematics though, but not diffcult to deduce from the specs given...

gcwills · 7th September 2010, 07:09 AM

You may wish to check out my 6CM5 amp posted here - 6DQ6 are a beefier 6CM5 and would work well in this amp with similar bias etc.

aardvarkash10 · 7th September 2010, 07:20 AM

absolutely! and they are pin compatible!!!!

I have built Grant's design (with some mods) and swap the two types in and out to suit my occasional whims...

Arnulf · 7th September 2010, 08:38 AM

Quote:

Originally Posted by porkchop61

Hi all-
One of them seems to have a tiny problem

Looks like the getter has gone white ? If that's the case, the tube is dead (it has lost its vacuum).

porkchop61 · 7th September 2010, 12:06 PM

Yes, the tube has a small crack up the side at the bottom. I knew it was dead when I saw that white getter.

Thanks for all the replies everyone, I'm still gathering info to decide what I want to build. Anyone know what these tubes like to see for OT impedance? 5k?

6th September 2010, 08:51 PM	#1
porkchop61 diyAudio Member Join Date: Aug 2004 Location: Mansfield, Connecticut	6DQ6 for audio power amp? Hi all- I got a good haul of tubes this weekend, and had 4 of these 6DQ6 tubes. Anyone ever seen these used for audio power amplifiers? And schematics floating around? Thanks in advance. Glenn One of them seems to have a tiny problem __________________ "Imagination is more important than knowledge"

6th September 2010, 10:13 PM	#3
porkchop61 diyAudio Member Join Date: Aug 2004 Location: Mansfield, Connecticut	Thanks Ray, good reading. I should probably have mentioned Hi-Fi and not guitar amps, but the reading is still interesting. I thought these would make a nice low powered PP stereo amp for me to play around with. I know they are a TV tube, but they should do pretty well as an audio amp tube with that type of anode rating! Glenn __________________ "Imagination is more important than knowledge"

7th September 2010, 03:01 AM	#6
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	this may help - specs for outputs between 34W and 84W using the 6DQ6-A in AB1 pp. No schematics though, but not diffcult to deduce from the specs given... __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

7th September 2010, 07:20 AM	#8
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	absolutely! and they are pin compatible!!!! I have built Grant's design (with some mods) and swap the two types in and out to suit my occasional whims... __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

7th September 2010, 12:06 PM	#10
porkchop61 diyAudio Member Join Date: Aug 2004 Location: Mansfield, Connecticut	Yes, the tube has a small crack up the side at the bottom. I knew it was dead when I saw that white getter. Thanks for all the replies everyone, I'm still gathering info to decide what I want to build. Anyone know what these tubes like to see for OT impedance? 5k? __________________ "Imagination is more important than knowledge"

6th September 2010, 09:40 PM	#2
rsumperl diyAudio Member Join Date: Oct 2009 Location: Binghamton, NY	Greetings from Binghamton, NY! There are schematics floating around the Internet that use the 6DQ6's. I believe they are in the 30w range. Here is a link that might help: 6DQ6 Substitution Ray

6th September 2010, 10:23 PM	#4
rsumperl diyAudio Member Join Date: Oct 2009 Location: Binghamton, NY	The "red board" uses sweep tubes and can be used as a guide. Personally I think that sweep tubes make great audio amplifiers. If I can be of any help, please feel free to email me @ rsumperl@hhk.com Ray

7th September 2010, 07:09 AM	#7
gcwills diyAudio Member Join Date: Jan 2010	You may wish to check out my 6CM5 amp posted here - 6DQ6 are a beefier 6CM5 and would work well in this amp with similar bias etc.

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