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Old 16th March 2011, 07:41 AM   #21
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Join Date: May 2005
Location: California
Quote:
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.
Daniel
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Old 6th November 2011, 12:02 AM   #22
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Join Date: Sep 2005
Quote:
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.

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