Search:

Type: Posts; User: Chuck H; Keyword(s):

Page 1 of 18 1 2 3 4

Search: Search took 0.07 seconds.

  1. ......

    ...
    https://music-electronics-forum.com/attachment.php?attachmentid=54288&d=1562930390
  2. And now we know your true heart. I'll see you...

    And now we know your true heart. I'll see you when the zombie apocalypse starts ;)
  3. Replies
    27
    Views
    765

    But, but... We did have a discussion on the...

    But, but...

    We did have a discussion on the asymmetrical totem arrangement here before. g1 links the circuit in question in post #21, Malcolm makes a good point on the matter in post #30 and Ian...
  4. Well his last activity was a couple of months...

    Well his last activity was a couple of months ago, but his most recent posts show he hasn't visibly participated since March? Let's hope he's just busy right now. Being as he's in Las Vegas he's...
  5. I would think a high fret would be a "popped"...

    I would think a high fret would be a "popped" fret. As I can't imagine any other way for a single fret to be high after any leveling. That should require different attention.

    I suppose a high...
  6. I fully believe it works, and well. It's a...

    I fully believe it works, and well. It's a terrific design, BUT... Since these are probably made overseas I would watch out for anomalous alignments of the active planes once they start to move and...
  7. Replies
    15
    Views
    405

    And I'll add, a conductive socket. This sometimes...

    And I'll add, a conductive socket. This sometimes happens with a catastrophic tube failure. Do we know if this may be part of the amps history? It hardly matters. Unfortunately testing the socket for...
  8. Replies
    27
    Views
    765

    Ah! Yes. I hadn't noticed the different cap...

    Ah! Yes. I hadn't noticed the different cap values on the later node at a glance. Kinda stupid design IMHO. Why not just make all three caps 100uf and call it macaroni!?! Fender has a couple of...
  9. Replies
    17
    Views
    527

    But because there's no shorting balance point...

    But because there's no shorting balance point there is NO voltage and then high voltage during the action of switching. Not to mention that the screen itself is disconnected from HV during the...
  10. Replies
    23
    Views
    655

    I understand this. But it's just not how it's...

    I understand this. But it's just not how it's been done most of the time and (therefor) it's probably not something you can automatically expect. There ARE switches that will handle the job. I've...
  11. Replies
    17
    Views
    527

    I've used plain ol Alpha rotary switches and just...

    I've used plain ol Alpha rotary switches and just doubled up the poles. By "electrical" standards it's not that demanding current wise. It's the voltage rating you need to pay attention to. I don't...
  12. Replies
    27
    Views
    765

    No pun intended? I've even seen this even with...

    No pun intended?

    I've even seen this even with axial caps. The ground is the case and there's only the thin, brittle and sheer shrink wrap around it. Most of the time this is not a problem because...
  13. Replies
    6
    Views
    262

    To expand on this... You absolutely can expect...

    To expand on this...

    You absolutely can expect asymmetry in most tube amps when clipping, but typically only when clipping hard. Hard as in pretty much a square wave. I mention it just so tubes...
  14. Replies
    17
    Views
    527

    That is how it's usually done. That is, keeping...

    That is how it's usually done. That is, keeping the existing screen grid resistors in the circuit.
  15. Replies
    23
    Views
    655

    And to add... No you don't have to replace the...

    And to add... No you don't have to replace the transformer if it has not failed. Just wire it correctly.
  16. Replies
    27
    Views
    765

    250/2=125uf 220/2=110uf I think it'll be...

    250/2=125uf
    220/2=110uf

    I think it'll be alright ;)
  17. Replies
    15
    Views
    405

    It's possible that the coupling capacitor feeding...

    It's possible that the coupling capacitor feeding the left position is leaking DC voltage onto that power tubes grid. Another possibility is a bad connection for the grid to ground resistor on the...
  18. Replies
    27
    Views
    765

    Schematic? And... With "totem pole" capacitor...

    Schematic?

    And... With "totem pole" capacitor arrangements the caps do share voltage (provided there are "balancing resistors"). This should be sufficient information for capacitor selection. A...
  19. Replies
    28
    Views
    605

    You're absolutely right. I didn't look at the...

    You're absolutely right. I didn't look at the schematic and took g1's post at face value. Looking at the schematic I see that the bias supply for the dr504 has room for adjustment in the voltage...
  20. Replies
    28
    Views
    605

    The KT66 is described as a "beam pentode" with a...

    The KT66 is described as a "beam pentode" with a max Vp of 500 and a max diss of 25W.

    The kt77 is described as a "beam tetrode" with a max Vp of 800 and a max diss of 28W.

    You have 503Vp at...
  21. Replies
    28
    Views
    605

    I like it :thumbsup:

    I like it :thumbsup:
  22. Replies
    6
    Views
    233

    Unfortunately we don't know what is happening....

    Unfortunately we don't know what is happening. Only that it's a "strong sound" :confused: My first thought was some kind of squeak or squeal due to a temporary oscillation caused by the new signal...
  23. Replies
    28
    Views
    605

    The kt66 is the smaller, more frail cousin to the...

    The kt66 is the smaller, more frail cousin to the kt77. You'll be taxing them hard with over 500Vp. I've had trouble with any new el34 at those voltages too. Crank it up to clipping and watch the...
  24. Replies
    6
    Views
    233

    No clue what exactly you're hoping for in an...

    No clue what exactly you're hoping for in an answer here. The capacitors are there in the amp. You've already located them. Measure them. Otherwise you must try to get a schematic and locate the...
  25. Replies
    15
    Views
    268

    Test for DC on those pots. Maybe the pots are...

    Test for DC on those pots. Maybe the pots are scratchy, but maybe there's voltage on them causing the noise. Maybe it's the board. Maybe a hair dryer will help, maybe not. Maybe it's the coupling...
  26. Replies
    28
    Views
    605

    Just a suggestion... Pull the original tubes and...

    Just a suggestion... Pull the original tubes and replace them with reissue counterparts and save the originals while they're still operational. Consider it protection for the investment. This way you...
  27. Replies
    15
    Views
    268

    Well it's easy to see if a conductive board may...

    Well it's easy to see if a conductive board may be responsible. First, hit it with a hair dryer for about a half hour. Just find something to do while you're at it and keep waving the hair dryer...
  28. Replies
    15
    Views
    268

    This^^^^^^^^^^^^^^^ And... Why did you replace...

    This^^^^^^^^^^^^^^^

    And... Why did you replace all the caps? It's predominantly the electrolytic caps that fail with age. Some posts by our local Randall have revealed a great deal more film cap...
Results 1 to 28 of 500
Page 1 of 18 1 2 3 4