Search:

Type: Posts; User: SoulFetish; Keyword(s):

Page 1 of 18 1 2 3 4

Search: Search took 0.03 seconds.

  1. Replies
    29
    Views
    423

    I don’t doubt that this happens. But its not what...

    I don’t doubt that this happens. But its not what happened in this case. All of the tubes were new, and it wasn’t oscillating at mains or rectified frequencies. I suspect the speaker/upside down...
  2. Replies
    29
    Views
    423

    Without listening to the audio (yet), this was...

    Without listening to the audio (yet), this was the first thing I thought of as well. I just worked on a Vibro Champ and ended up chasing down a problem similar to this. Ended up being the new 5Y3...
  3. Yeah that’s kind of wild. ‘Gotta wonder if there...

    Yeah that’s kind of wild. ‘Gotta wonder if there was some acoustic feedback getting picked up by the 2 unused speakers, and getting reflected back to the output stage and causing instability. Of...
  4. I like this idea ^^ For switching tube amp...

    I like this idea ^^

    For switching tube amp outputs, wouldn't MBB power relays be the way to go as well?
  5. Product Review: Fender Blues Junior FBJ (cream board) replacement tube PCB by MOX

    I've known about this product for a while, and withing the last couple of months, I saw it became available for purchase in the US through the seller's Reverb store:
    Fender Blues Junior FBJ (cream...
  6. Replies
    10
    Views
    294

    Oh i just switched in a voltage divider...

    Oh i just switched in a voltage divider simultaneously when switching out feedback. Ill try and find a schematic of it
  7. Replies
    10
    Views
    294

    I've done it two ways. The first, is adding a 10M...

    I've done it two ways. The first, is adding a 10M (or some high value resistor like 5M6, or something) in series with the feedback resistor for the -basically equivalent- "no feedback" position. With...
  8. Replies
    33
    Views
    1,663

    I'm not looking at a schematic, but if these are...

    I'm not looking at a schematic, but if these are the diodes and caps in your LV supply, I almost never see these fail. I can't remember needing to replace them (they're not a common mode of failure...
  9. Replies
    33
    Views
    1,663

    Fine enough, these may not have needed changing....

    Fine enough, these may not have needed changing. But since it's your amp/money/time, no harm in replacing the with new ones.
    There are usually clear visual signs when these are faulty. ie. like...
  10. Replies
    119
    Views
    2,334

    I built this little rig so all i have to do is...

    I built this little rig so all i have to do is run 2 pairs of test leads to the transformer

    55387
  11. Replies
    119
    Views
    2,334

    The fastest, accurate method of testing a...

    The fastest, accurate method of testing a transformer for a short is to disconnect any load from all the windings. Then connect a 9V battery through a momentary switch across the lower impedance...
  12. Replies
    33
    Views
    1,663

    Okay, you’re in luck. I just had one on my bench...

    Okay, you’re in luck. I just had one on my bench and logged some photos of the work. Hang tight, and ill try and upload these tonight with some suggestions.
  13. Replies
    119
    Views
    2,334

    No doubt. I saw Juan’s post it got a little...

    No doubt. I saw Juan’s post it got a little excited. I made the classic mistake of not seeing page 2
  14. Replies
    119
    Views
    2,334

    OR you can run all three 4, 8, and 16 ohm loads...

    OR you can run all three 4, 8, and 16 ohm loads together in parallel to get 2 ohms (~about)
  15. Replies
    119
    Views
    2,334

    Friggin’ THIS ^^^^!! Run a 1kHz sine wave in...

    Friggin’ THIS ^^^^!!

    Run a 1kHz sine wave in the input, and check the output on a scope. This will tell you alot. For instance, whether or not you’re only getting one half of the pushpull signal...
  16. Replies
    33
    Views
    1,663

    Issues? Do you mean you’re hearing audible...

    Issues? Do you mean you’re hearing audible buzzing coming from the main board?
    If your issue is caused by the ceramic snubbers (like rhe OP), I’ve never know it to cause any kind of problem in...
  17. To insert my own 2 pennies into this topic, this...

    To insert my own 2 pennies into this topic, this parameter would be the biggest determining factor in choosing any electrolytic cap. (IMO)
    In fact, this is the main reason I use film caps wherever...
  18. Replies
    7
    Views
    205

    Yup.

    Yup.
  19. Good stuff Ian. Along with high ripple current...

    Good stuff Ian. Along with high ripple current ratings, aluminum electro's life can be extended as well by operating the cap at a lower voltage that it's max rating. Although, according to data...
  20. okay, here is how it works: It has to do with...

    okay, here is how it works:
    It has to do with the manufacturers providing a published general "expectancy" of working life for the cap. This is usually stated in hours at it's MAX ambient operating...
  21. Something like this could have happened. Because...

    Something like this could have happened. Because the membrane Mick was talking about looked like it was shredded but still inside the box. The only thing is, the contents looked like the would have...
  22. Replies
    7
    Views
    325

    Do it.. What's the worst that can happen? ...

    Do it.. What's the worst that can happen?
    ...
  23. Marshall, what were you thinking shiipping a transformer like this???

    It's probably a good thing my boss he wanted to deal with Marshall, and didn't let me call Marshall service today after receiving this transformer.
    Some brief context... I customer bought a used...
  24. Replies
    70
    Views
    2,301

    Indeed :thumbsup:

    Indeed :thumbsup:
  25. Replies
    70
    Views
    2,301

    I suppose. But it serves as the negative voltage...

    I suppose. But it serves as the negative voltage reference point in the same way any cathode biased common cathode stage does where the grid leak is tied to ground. This was the only comparison I was...
  26. I used to live in Dallas (briefly), on Swiss Ave....

    I used to live in Dallas (briefly), on Swiss Ave. If I ever find my way down ther again (It'll probably be on my way to Austin) I'd definitely be interested in checking out your amps/shop. I'm...
  27. Chuck, you’re my EL84 brother here at the forum....

    Chuck, you’re my EL84 brother here at the forum. While I’ve only ever heard clips of Trainwrecks, the trainwreck liverpool is the best sounding amp Ive ever heard. Definitely an inspiration for me to...
  28. Replies
    18
    Views
    474

    I, for one, hope Fender never stops making their...

    I, for one, hope Fender never stops making their Blues/Hotrod amps.
    Some brilliant member here said ‘The Fender Hotrod series is to amp techs what Microsoft Windows is to IT guys, a reliable and...
Results 1 to 28 of 500
Page 1 of 18 1 2 3 4