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Old 24th October 2010, 09:13 AM   #11
Jaap is offline Jaap  Netherlands
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Quote:
Originally Posted by gaetan8888 View Post
Hello

I have a Pioneer SX-34 with a defect FM tuner section, since I did not find the problem of the FM tuner section, I would use the transfos and output tube to made a good tube amp...

As it is the SX-34 amp sound good but maby I can find a better schematic than the SX-34 amp section.

Any better push pull tube amp schematic than the SX-34 amp ?

I dont think it would need a 12AX7 input tube since cd player give arround 1 volt output and this voltage can drive the driver section of the 6BM8 tubes.

Here's a link to the schematic of the Pioneer SX-34;

AK Database PDF Gallery - Pioneer Receivers/Pioneer SX34 Schematic

Bye

Gaetan
These designs can be found somewhere on this forum. They both work/sound good. Headphoneamp is from Shoog
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Last edited by Jaap; 24th October 2010 at 09:16 AM. Reason: forgot something
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Old 24th October 2010, 07:34 PM   #12
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Quote:
and put a zobel network at the output transformer secondary
Hi Gaetan, why did you think this was necessary and what values did you end up using

Hi Jaap, interesting 1st circuit, any more info

Brgds Bill
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Old 24th October 2010, 10:17 PM   #13
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Originally Posted by Soonerorlater View Post
Hi Gaetan, why did you think this was necessary and what values did you end up using

Hi Jaap, interesting 1st circuit, any more info

Brgds Bill
Hello

If somebody borrow my amp and try it without connecting loudspeakers.

If this amp work without a load, and if there is some oscillations or rf noises at the input, the voltage of the output tubes can goes quite high and burn the output transformer primary winding.

I've use 10 ohm with 100 nf.

Bye

Gaetan

Last edited by gaetan8888; 24th October 2010 at 10:20 PM.
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Old 24th October 2010, 10:26 PM   #14
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Thanks for that

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