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Hoffman Amplifiers > Amp Stuff > Schematics and Diagrams > Schematics (Moderators: Geezer, tubenit, PRR, sluckey) > Single Channel AB763 no verb/vib
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tubenit
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« on: December 24, 2008, 08:38:11 pm »
A forum member wanted a clean sounding AB763 without reverb or vibrato. Numerous forum guys chipped in with their thoughts on this. This is the result. 12/'08

Tubenit

* Single Channel AB763 no verb-vib.jpg (87.71 KB, 825x553 - viewed 879 times.)
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« Reply #1 on: December 24, 2008, 10:03:23 pm »
Do you think you need the two 220k resitors between the preamp and the PI.  Actually, can't you remove one of the coupling caps there too (Just use the .001)??  Just a thought.
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« Reply #2 on: December 25, 2008, 11:32:48 am »
Yes, you could lose the .047uF, 220K and 270K. Just connect the .001uF directly between V1-6 and V2-2. Doing so removes the voltage divider (220K/270K) that the normal channel must go thru to get to the PI, so you'll hit the PI with a hotter signal (100% v 55%).

The reason those components were included was to more accurately copy the circuit of the AB763 as seen by the normal channel. (The vib channel tube impedance was ignored)
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« Reply #3 on: December 30, 2008, 05:34:31 pm »
Would the hotter signal cause a loss of headroom? 
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« Reply #4 on: September 08, 2009, 06:13:32 pm »
Could you do this same thing but drop two 6l6s?
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tubenit
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« Reply #5 on: September 09, 2009, 05:47:46 am »
Sure you can drop a pair of 6L6's and then re-bias it.

Tubenit
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