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    Got this thing figured out.. it was actually much...

    Got this thing figured out.. it was actually much simpler than I thought. If you look at the schematic, you have a transformer with a center tapped secondary, leading into a full wave rectifier,...
  2. Thanks! Yeah it definitely seems to be something...

    Thanks! Yeah it definitely seems to be something with the DC biasing on the output transistor, I've all but got rid of the hum/buzz completely now by tweaking the variable resistor at the base of...
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    This is an old thread, but I finally got around...

    This is an old thread, but I finally got around to working on this project again (have a little more free time right now..) So I ended up getting this thing to power on by applying positive and...
  4. OK!!! So I pretty much got this thing working......

    OK!!! So I pretty much got this thing working... When I first started taking a look at it a while back, I was pretty inexperienced and I'm a bit embarrassed to say I never checked the voltages on...
  5. Thanks for all the replies folks. I've made a...

    Thanks for all the replies folks. I've made a little bit of progress and have come to a bit of a revelation, but first let me answer and comment back. dmeek, there are NO bad resistors or diodes...
  6. Realistic STA-225 - outputs sound for a second or two, then disappears

    I'm trying to figure out what's wrong with a Realistic STA-225 receiver/amplifier that I picked up at a swap meet. When I first powered it on, I got no sound at all, so I opened it up and checked...
  7. Fixed it. It was one or several of the opamps. ...

    Fixed it. It was one or several of the opamps. I replaced all of them that were on the preamp. I agree though J M, I would do it more precisely next time and try and find the exact culprit, still...
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    OK, here's the full schematic 55366 Thanks

    OK, here's the full schematic 55366

    Thanks
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    Good idea, I'll try this. Probably going to need...

    Good idea, I'll try this. Probably going to need to get another bench power supply though because I don't think I can get + and - 15V out of one channel, right?
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    Furman Punch-10 transformer

    I recently acquired a Furman Punch-10 rackmount unit missing its transformer. I was able to get the schematic for the unit, it shows the windings of the transformer, but no further detail (see...
  11. I'm going to try replacing all the op amps on the...

    I'm going to try replacing all the op amps on the preamp... was getting weird readings on a couple of them.
  12. It's not the HA3500, it's the 3500 MOSFET, like...

    It's not the HA3500, it's the 3500 MOSFET, like DrGonz78 posted.
  13. Hartke 3500 MOSFET white noise preamp issue

    Hi all, first post on this forum. I've been doing a lot of searching for this problem I'm having and I've come across a post or two that were rather close but not quite exactly the same. I'm trying...
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