Probing around, here's what I'm getting: Power resistors: ~115VAC across each Large transformer: 0V in, 0V out Small transformer: 115VAC in, 18.5VAC & 5VAC out

The startup resistors have been replaced with 5.6 ohm 5W wirewounds, but the output transistors have not been replaced yet. Now, are you talking about the smaller transformer secondary windings? I didn't check them for proper voltage. I will dig in there. But I do want a quote on those transistors. Also, the tuner is not remembering my presets.

For a "warmer" sounding opamp, try an OPA2604. I have used both the 2604 and 2134 in a couple modded tuners, and there is definitely a sonic difference. Interestingly, an older tuner (Kenwood KT-7500, heavily modded w/2134) and a newer tuner (Audio Dynamics T-200, mild mods w/2604) wound up sounding identical , to me. It sounds like the 2604

Here's what's happening: At startup, RL2 instantly closes. However, RL1 never does. So I have full preamp/control functionality, but there is NO 55V voltage in the system. RL1 never energizes, there is 0V across its terminals, traceable back to the "delayed start" circuitry on Module 6. I get lost there, though. The capacitor is new

Can you tell me what op amps are in the signal path? I'm currently rebuilding a BM8000.

I know this thread is so 2009 , but I wanted to report in that this fixed (so far) a big problem with my BM8000. The wires went in pretty cleanly, and it looks no worse than some other "factory" circuit modifications I've seen! Thank you, Peter and geearr, for the circuit information. And thank you, burantek, for pointing me to this thread

Update: this morning I replaced the bad power resistors on the startup board. But the problem is continuing. I've traced it back to the "delayed relay" section of the power supply board (6). Could the receiver be refusing to come out of a "protect" mode?

I discovered something: the two diodes on the startup board test OK (out of circuit, of course). However, the two big power resistors, 5.6 ohm, measure at ~200K! That would certainly explain the lack of power to the transformer, as those are the first components the AC sees as it comes in from the mains. Time to look through my junk and see what I've

Thanks, Martin. I already have the SM, but didn't see the error code matrix before. I just found it. I will definitely check 9IC3, especially in the vicinity of pin 31. The unit works for a while, so I imagine the issue is heat related. Possibly a bad solder joint, or debris, or something. Thanks for the direction. I will check over the startup

There are two distinct relay "clicks". I'm not sure how many there are onboard, though. I believe the fuses are good, also. One I visibly checked, the other ohmed at a dead short. I'm thinking something happened on that board, but what? Other than the relays, fuses, wires, and two big resistors, there are two small diodes. They "look"