6GK5 to drive a 6AS7?

G · 28th March 2008, 10:45 AM

Is anyone familiar with the "sound" of a 6GK5? It certainly has the specs to drive a 6AS7. I think it will work better in the circuit below in place of a 396A.

ilimzn · 28th March 2008, 01:16 PM

Quote:

Originally posted by G
Is anyone familiar with the "sound" of a 6GK5? It certainly has the specs to drive a 6AS7. I think it will work better in the circuit below in place of a 396A.

The plate and grid of the 6AS7 in the schematic are the wrong way around...

G · 28th March 2008, 03:32 PM

You are correct! I will have to fix that.

G · 28th March 2008, 04:02 PM

Here is a corrected schematic with the 6GK5 and it's operating points. Thoughts?

nafanja · 28th March 2008, 11:30 PM

What if you use 6S45P or power penthode like Russian 6E6P,6j5 and Your resistor in anode to highest transformer site.
6s45 in 40ma like 6E6 or 6J5.

In anode 6s45 = 190V,
+190 for catode 6AS7 (190-190 = 0)
Ra(6s45)200 Volt/0.04 = 5kOm

Total voltage is 200+190 =390V
Near 60V in 1V in input of 6S45 You will get.

Use Loftin Wite(without caps and transformers.

More expensive, but if You hear - give me know(i don't know what is cleary than ware).

Bob Lee · 26th April 2008, 06:49 PM

Gavin,

By any chance that you have built the amp using the 6GK5 driver?

Recently, I switched my 45 SET amp from SRPP 6SL7 to 6GK5 driver, I really like the sound of 6GK5 running at 10ma. High is smooth and bass is tight.

Your schematic is just perfect for me to try using 6GK5 as driver to 71A SET. B+ 180v (fixed bias )to 210v (cathode bias )for 71A.

Bob

Miles Prower · 26th April 2008, 07:43 PM

Quote:

Originally posted by G
Is anyone familiar with the "sound" of a 6GK5? It certainly has the specs to drive a 6AS7. I think it will work better in the circuit below in place of a 396A.

As far as the grounded grid, small signal UHF triodes go, the 6GK5 has the most linear plate characteristic. Even though this wasn't intended for audio use, it looks pretty good and definitely worth a try.

Poindexter · 27th April 2008, 04:33 AM

Yup.  Good device.  When I changed from 5965 to 6GK5 to drive PP 6v6s, the new transparency was thrilling.

Of course, the 5965 isn't all that linear.

Aloha,

Poinz

28th March 2008, 03:32 PM	#3
G diyAudio Member Join Date: Apr 2002 Location: Belleville, IL.	You are correct! I will have to fix that. __________________ Gavin

28th March 2008, 11:30 PM	#5
nafanja diyAudio Member Join Date: Mar 2008	What if you use 6S45P or power penthode like Russian 6E6P,6j5 and Your resistor in anode to highest transformer site. 6s45 in 40ma like 6E6 or 6J5. In anode 6s45 = 190V, +190 for catode 6AS7 (190-190 = 0) Ra(6s45)200 Volt/0.04 = 5kOm Total voltage is 200+190 =390V Near 60V in 1V in input of 6S45 You will get. Use Loftin Wite(without caps and transformers. More expensive, but if You hear - give me know(i don't know what is cleary than ware). __________________ Shippment: $:Europe: 1,2 x (16+2,45 x Weight(kg)) N. Amerika & Asia: 1,2 x (10 +4,9 x Weight(kg))

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26th April 2008, 06:49 PM	#6
Bob Lee diyAudio Member Join Date: Mar 2006 Location: SF	Gavin, By any chance that you have built the amp using the 6GK5 driver? Recently, I switched my 45 SET amp from SRPP 6SL7 to 6GK5 driver, I really like the sound of 6GK5 running at 10ma. High is smooth and bass is tight. Your schematic is just perfect for me to try using 6GK5 as driver to 71A SET. B+ 180v (fixed bias )to 210v (cathode bias )for 71A. Bob

27th April 2008, 04:33 AM	#8
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	Yup.  Good device.  When I changed from 5965 to 6GK5 to drive PP 6v6s, the new transparency was thrilling. Of course, the 5965 isn't all that linear. Aloha, Poinz

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