output tranny for 6AK6

PRNDL · 9th January 2008, 06:14 PM

I'm converting an old Mono amp into a tube guitar amp.
Originally the amp used two 35C5's in push-pull.
The new amp uses one 6AK6 in single-ended.

Can I use the output transformer in the new amp?

35C5 has plate R = 13K and load R = 2.5K
6AK6 has plate R = 200K and load R = 10K

My guess is that this would be fine if I cut the center tap (2.5K + 2.5K), or I could use a Fender Champ OT (6V6 at 5K).

Is this correct?

Thanks!!

PS
That doesn't sound right at all! I reasoned that 6AQ5 and 6AK6 are similar tubes, with the former equivalent to a 6V6.

tubewade · 9th January 2008, 06:30 PM

The biggest problem with doing that will be saturation of the core in a transformer without an air gap. It shouldn't damage anything, but I wouldn't expect the sound to be very good either.

Also, if the transformer is 2k5-0-2k5, and you neglect the centre tap, it won't be 5k. You have doubled the turns ratio which quadruples the impedance ratio. You would then have a 10k primary.

Tom Bavis · 10th January 2008, 08:47 AM

Push-pull 35C5 or 50C5 will probably use 4-5KCT. The 6AK6 uses 10K for maximum power, but you can try it... it doesn't draw much current, so it may not saturate TOO badly...

9th January 2008, 06:14 PM	#1
PRNDL diyAudio Member Join Date: Oct 2006	output tranny for 6AK6 I'm converting an old Mono amp into a tube guitar amp. Originally the amp used two 35C5's in push-pull. The new amp uses one 6AK6 in single-ended. Can I use the output transformer in the new amp? 35C5 has plate R = 13K and load R = 2.5K 6AK6 has plate R = 200K and load R = 10K My guess is that this would be fine if I cut the center tap (2.5K + 2.5K), or I could use a Fender Champ OT (6V6 at 5K). Is this correct? Thanks!! PS That doesn't sound right at all! I reasoned that 6AQ5 and 6AK6 are similar tubes, with the former equivalent to a 6V6.

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9th January 2008, 06:30 PM	#2
tubewade diyAudio Member Join Date: Jun 2007	The biggest problem with doing that will be saturation of the core in a transformer without an air gap. It shouldn't damage anything, but I wouldn't expect the sound to be very good either. Also, if the transformer is 2k5-0-2k5, and you neglect the centre tap, it won't be 5k. You have doubled the turns ratio which quadruples the impedance ratio. You would then have a 10k primary.

10th January 2008, 08:47 AM	#3
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Push-pull 35C5 or 50C5 will probably use 4-5KCT. The 6AK6 uses 10K for maximum power, but you can try it... it doesn't draw much current, so it may not saturate TOO badly...

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