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807 pp amp - help
807 pp amp - help
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Old 16th March 2011, 07:41 AM   #21
danFrank is offline danFrank  United States
diyAudio Member
Join Date: May 2005
Location: California
807 pp amp - help
Originally Posted by Circlotron View Post
The connection of the 807 cathodes to the OPT is for negative feedback. The 8 ohm tapping is the centre tap of the secondary.

The 4 ohm tap is actually the center point of the secondary, as Tom said. The voltage at the 4 ohm tap will be 1/2 of the voltage at the 16 ohm tap.
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Old 6th November 2011, 12:02 AM   #22
bottom_feeder is offline bottom_feeder  United States
diyAudio Member
Join Date: Sep 2005
Originally Posted by planet10 View Post
You are right. That one would only work if you were converting it to cathode bias.

This is the 807 (1625 is just a different heater V) that i like best... i'd probably use something like 6922 or 6H30 on the front.

Click the image to open in full size.

I have the whole article scanned if you are interested.

isnt the 7N7 the loctal equivalent to a 6SN7 ? that'd make a very cool oddball amp . . . .
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