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Old 15th March 2011, 08:25 AM   #1
Beer30 is offline Beer30  United States
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Join Date: Dec 2010
Default Noob: Fabricate a missing channel

I've been given an Audire Forte that is .... umm .... mostly complete. Both sides of the dual mono power supply are there but a heatsink and one whole channel is missing. It's all single layer PCB. I've got the one side to work with. Three interrelated questions:

1. Anyone familiar with the circuit and/or have a circuit diagram? (I wouldn't be surprised if the answer to the diagram is no. Hours of googling have left me empty handed but it never hurts to ask.)

2. Is it at least marginally sane for me to try to build the missing half without a lot of amplifier experience? (I've done some recapping but nothing requiring me to do any sort of semi-rigorous qualitative or quantitative circuit analysis.)

3. Am I going to have insurmountable issues making the new channel sound like the old channel with different transistors? (RoHS vs non-RoHS) If so, will I need to change anything other than transistors on the non-delinquent channel?

Also, for all the doubters about #2, can you suggest a design that I could use with the righteously massive PTs. My rail voltage is a nice steady 60VDC. (That's not question 4, it's part of number 2 )

I've already got pic's of the trace side of the board to do a photopaper transfer pcb. I'm feeling capable of the physical construction but not so sure on the balancing, biasing, etc.

Is this amp worth the effort or am I better off scavenging parts and building a new amp? From that perspective there is a lot to work with in this old chassis.

Any and all input is appreciated. Willing to listen and learn.
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