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  1. Raccoon1400

    Anyone have success repairing a broken potentiometer?

    Yeah but it is usually better to bridge with solder and a cut lead. Got a picture of what you are trying to fix?
  2. Raccoon1400

    Pioneer SX-650 Tuner Issue

    I've done lots of RF alignment and cleaning of tuner gangs. If it was that, I'd have this thing solved and on its way. That sort of stuff I can do easily enough. Diagnostics on the other hand, is where I get lost. I forget and would have to set that up again. But I got a good strong signal. If...
  3. Raccoon1400

    Pioneer SX-650 Tuner Issue

    I've got an SX-650 on the bench and FM is very very weak. The tuning meter swings around a bit. I managed to force a signal through it on the signal generator and tweak the RF alignment a bit. I managed to get the signal meter to deflect a few mm with the strongest signal the sencore could put...
  4. Raccoon1400

    Dynaco ST-120 speaker coupling capacitors

    I restored one of these recently and had to use smaller caps for the output caps. So I just replaced the wrapped wire with a new inductor. I'd found a schematic with the value. Schematic in post 2 here, showing the inductor as 10uH. I used that value without issue...
  5. Raccoon1400

    What's the weirdest factory mistake you've found?

    They would have to be VERY good at soldering. I've been doing this for a decade and I can resolder wires onto a pot plenty neatly, but to do it without leaving some evidence is a tall order. I can't imagine why someone would have swapped these two controls after the fact, but it is easy to...
  6. Raccoon1400

    What's the weirdest factory mistake you've found?

    I had a Sansui 890db in here recently that had one channel out in just phono 2. Turned out there was a bridged solder connection on the ribbon cable that was soldered to the input jacks. Looked to be factory. It took me a bit longer than it should have to find that. Every time I get stuck on...
  7. Raccoon1400

    What's the weirdest factory mistake you've found?

    As a design error or as an assembly error? This appears to have been an assembly error.
  8. Raccoon1400

    What's the weirdest factory mistake you've found?

    This one had me scratching my head. I just finished restoring a Luxman L-100 and I noticed the bass was being cut when I engaged the tone section. I could even it out by turning the bass up to about 3-4 o'clock. I messed around for almost 2 hours trying to figure out what could be causing this...
  9. Raccoon1400

    Celestion Ditton 25 Tweeter Impedance

    Here's the schematic I have. I know the woofer impedance is wrong on here. But the HF1300 impedance is correct.
  10. Raccoon1400

    Celestion Ditton 25 Tweeter Impedance

    I'm rebuilding a pair of these, and both tweeters are blown. Replacement diaphragms are available, but I have a problem. I have no idea if I need the 4 or 8 ohm version. The Ditton 25 uses the HF2000 which exists in both impedances. The only thing I could find is a schematic someone drew up that...
  11. Raccoon1400

    McIntosh MC2100 power on pop

    I replaced the thermistors and the pop was better for a while, but now the client says it is getting bad again. Did the new thermistors really wear out that fast? Should I be adding a speaker relay to this thing?
  12. Raccoon1400

    Dynaco PAS hum in one channel

    Those two points are already connected by the traces?
  13. Raccoon1400

    Dynaco PAS hum in one channel

    Thanks for the reply. Was about to give up on this one. Neatened up the wiring a bit more and twisted those blue transformer wires. No change though. Here's the current pictures. Anything glaring that could still be the cause?
  14. Raccoon1400

    Unobtanium power switch relay fix

    I've probably done the triac mod well over 100 times by now.
  15. Raccoon1400

    Is it worth replacing output trannys?

    Ah, a thread from the good ol' days when the onsemi TO-3s were less than half the price they are now...
  16. Raccoon1400

    Dynaco ST-70: Should I trust this transformer?

    I do often add cathode resistors. Makes measuring bias easier too.
  17. Raccoon1400

    Dynaco ST-70: Should I trust this transformer?

    Yeah it seems to have been a tube failure, and one of the tubes is shot.
  18. Raccoon1400

    Dynaco ST-70: Should I trust this transformer?

    I got around to pulling off the cover of the transformer. It don't look so great. It don't smell so great either. :oops:
  19. Raccoon1400

    Dynaco ST-70: Should I trust this transformer?

    The choke is toast in no uncertain terms. Must have been almost on fire. I have the replacement, no question here.
  20. Raccoon1400

    Dynaco ST-70: Should I trust this transformer?

    "Sam's Audio Lab" Second picture shows what has melted out a bit better maybe
  21. Raccoon1400

    Dynaco ST-70: Should I trust this transformer?

    I have this Dynaco ST-70 on the bench. It has suffered a major meltdown. One of the tubes failed, the choke is fried. I've been supplied with the choke. There is a good deal of melted wax that has leaked out of one of the output transformers. But both transformers measure the same with the ohm...
  22. Raccoon1400

    2330B and DBT

    It is a big receiver so the bulb will glow brighter than with a smaller receiver. How bright is it? In addition to bias, check DC offset, power supply voltage, etc. EDIT: I could have read the post a bit better. But I'd check the power supply voltages next. I looked up a picture and the power...
  23. Raccoon1400

    Marantz 2235B FM Stereo intermittent

    It seems to be a problem on the IF board. Probing H206 seemed to bring it back to stereo sometimes. I then replaced H205-208 with KSC1845. I'd already swapped the first group of transistors out but put the originals back in. I turned it on, and it took a few minutes for stereo to come back, but...
  24. Raccoon1400

    Marantz 2235B FM Stereo intermittent

    Is there a way to set the discriminator without a distortion meter? I did play around with everything though.
  25. Raccoon1400

    Marantz 2235B FM Stereo intermittent

    I've got a Marantz 2235B on the bench and the FM stereo comes and goes. It takes a few minutes to kick in when I turn the unit on. It then goes in and out of stereo in roughly equal intervals, maybe around 5-10 minutes? I've changed caps on the IF and MPX boards to rule that out. Poking around...
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