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Something doesn't jive. The wires on the board end are as follows: Red= Collector Black= Base Brown=Emitter Please confirm

I`m beginning to think I wasted a lot of money on that EBay kit :(

Replaced R19 with a 1K, no real change :(

No worries Lee, I had a similar day..

Hi Joe, Q6 is a 2N3415. I still have the originals. As for R19, I`ll have to hunt down a 1K. Any point in putting the original Q6 back in?

New measurements Installed new Q`s 1,2,3,4 today. Put amp on DBT, brought up variac to 120, bulb stayed dim but LED board didn't light up anymore :confused2: (rail voltage only +40 0 -40)Offset was about .020 on both channels. Passed the bulb test so I took it out of circuit and brought variac...

Please tell me they are not made in PRC :(

Is that safe to do? Should I put the 410s in first?

The output transistors are On Semi as well albeit 15024s, they should be better than the Delco`s in any case. So there is nothing more that I can do until they get here? I`m glad things are starting to take shape :) thanks again guys.

Found both (On Semi) at Digikey

Newark is an American company that I used in the past. Scary fast shipping, 2 days from NC, transport , taxes duties brokerage etc for a $13 flat fee, no, that is not a typo.. Unfortunately the MPSA 92 are non stock items and Mouser don't carry them so I`ll have to find them elsewhere, suggestions?

I forgot to mention the 410s arrived this morning :)

Will these do ? http://canada.newark.com/on-semiconductor/mpsa18rlrag/bipolar-transistor-npn-45v-to/dp/84K8806 http://canada.newark.com/multicomp/mpsa92/transistor-pnp-to-92/dp/12P5646?mckv=szSKoCbNn|pcrid|23947165793|plid|&CMP=KNC-G-SKU-OTH-MULTICOMP

OK, I`ll place an order at Newark for those transistors. Lee, will you still be sending that driver board out? If your referring to the output protection board, there is no way in Hell that things going back in :toothy10:

He does seem to know a thing or two about these amps, :) I`m sure Bob would be impressed. I could never have gotten this far without BOTH of you guys, I`m sincerely grateful. What`s the next step?

Oh? how would that manifest itself? Read my previous post :)

Damn your good : R6 in my case is comprised of a 200K and 30K in series for some reason. An in circuit test showed up as open, turned out to be the 200K however, when I pulled them from the board, one of the pads was lifted but he 2 resistors now tested fine :confused2: I put them back in and...

D3 measures good out of circuit R7 measures 330K Q1 E 2.6vdc B .023vdc C 104 vdc Q2 E 2.6vdc B 3 vdc C 104 vdc Q3 E 104vdc B 100vdc C .023vdc Q4 E 104vdc B 100vdc C minus 106vdc

I invested in a pair of those mini probe type clips just for this project :) Base voltages on both Q3 and Q4 are 100vdc :sad2:

Q4 test points please