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Old 14th March 2004, 07:21 PM   #1
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Default 6ag7 metal pentodes

I have four NOS 6ag7 pentodes in my spares box. Does anyone know if these are suitable for audio use ?
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Old 14th March 2004, 09:11 PM   #2
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All tubes are suitable for audio!

(Even CRTs, for which without, how would most of us be here? )

Let's see.. video amp so not particularly powerful. Relatively high Vsat, especially at high Vs. Might be able to find a use in PSE, pentode or UL mode. I wouldn't bother with triode mode given the low power. Can probably get 10W in PP class AB1 into a 6V6 sized OPT (that is, 10ka-a).

Tim
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Old 15th March 2004, 05:38 AM   #3
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You can use the 6AG7 as a driver stage for a power triode. I tried them driving a 300B. They were very lively sounding, I recall, probably because they were rather microphonic.
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Old 28th March 2004, 12:13 PM   #4
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Thanks for the info. It looks like some of the other tubes in my collection would be more suited to audio fun. If anyone would like to give the 6ag7s a new home then just get in touch.
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Old 8th October 2007, 07:30 AM   #5
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I designed a power amp that uses 6AG7's and have four on the way. I have no cash but would love to experiment I'll scan the schematic tomorrow... in the meantime, I'd love your spares
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Old 14th December 2012, 08:14 AM   #6
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Quote:
Originally Posted by martinab2 View Post
I have four NOS 6ag7 pentodes in my spares box. Does anyone know if these are suitable for audio use ?

It's too late for this answer, but this tube is Russian equivalent 6P9 tube in metallic balloon is great for audio, especially if you do not want too much power.
I think a stereo 2x4W sound amplifier in Class A SE auditions quality is sufficient for a normal apartment, of course, are necessary and high quality speakers with SPL.
Two tubes 6J4 and two tubes 6P9 can make a great amp but with a vintage look.
Even though it's late response I hope that this project can be useful for other DIY audio enthusiasts.
I posted two projects: one with 6J4 and one attack with attack ECC85

tube 6AG7 equals tube 6P9
Attached Images
File Type: png 6P9 SE ATAC 6J4.png (34.2 KB, 336 views)
File Type: png 6P9 SE ATAC ECC85.png (29.6 KB, 337 views)

Last edited by LAZAROIU; 14th December 2012 at 08:19 AM.
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Old 14th December 2012, 11:08 AM   #7
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I also like the look and features of 6P9.
I once built a 15 W PP-UL prototype with Soviet metal tubes.
Below some info.

Click the image to open in full size.

Click the image to open in full size.
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Old 14th December 2012, 11:21 AM   #8
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Very nice this project, I think it has a great sound.
Congratulations!
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Old 14th December 2012, 11:40 AM   #9
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Quote:
Originally Posted by Sch3mat1c View Post
All tubes are suitable for audio!

(Even CRTs, for which without, how would most of us be here? )

Tim
Mm, I don't believe you. I ca't imagine a 5U4, a Klystron, a Magnetron, a Vidicon, or a Thyratron amplifiying audio
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Old 3rd June 2013, 02:19 PM   #10
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I'm interesting in building an 6550 SET amp with 6SJ7/6AG7 (actually their Russian counterparts 6Ж8/6П9). The choice of tube is just upon my liking.
And I'm thinking of using the 6AG7 as cathode follower. Anyone can help me with some hints for operating point?
Thanks,
Duong
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