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It is currently 25 Sep 2018, 06:44

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PostPosted: 14 Sep 2018, 03:56 
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Joined: 10 Nov 2013, 05:03
Posts: 11
Hello,

I have years used williamson amp
Attachment:
amp.jpg
with my 8 ohm speakers. Now I have built a 16 ohm speakers and switched the secondary winding
Attachment:
Screenshot_2.png
to match it but getting terrible noise from my amp. What could be the problem in the connection? Some thoughts was that negative feedback should be connected to other output. I have connected to 16 ohm output.
Using 6SN7GT preamp tubes and 807 power tubes and HAMMOND 1645
Attachment:
Screenshot_1.png
output transformer.
http://www.hammondmfg.com/pdf/5c0051-52.pdf


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PostPosted: 14 Sep 2018, 12:44 
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Joined: 19 May 2011, 05:38
Posts: 28
Your negative feedback became positive. recheck the polarity of your secondary connections


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PostPosted: 17 Sep 2018, 23:50 
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Joined: 10 Nov 2013, 05:03
Posts: 11
mike567 wrote:
Your negative feedback became positive. recheck the polarity of your secondary connections

It has 22K in negative feedback and I increased it to 56K, so now its all ok. Do anybody know how to choose correct one?
Attachment:
amp.jpg


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