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  1. Replies
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    Here's a link to the actual MOV (Varistor) so you...

    Here's a link to the actual MOV (Varistor) so you can purchase through Mouser if you are so inclined.
    ...
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    How about eliminating the diodes and using...

    How about eliminating the diodes and using Varistors between the CT and each leg of the push pull to protect the output transformer ?

    It's my understanding that this is "dormant" until you reach...
  3. LOL, yes I will be short, as I don't want to be...

    LOL, yes I will be short, as I don't want to be shot ! I have to start proof reading I think.

    I drank a little last night, but I am reasonably sober now, one would think anyway.:)
  4. Excellent comments so far, so I will be 'short' -...

    Excellent comments so far, so I will be 'short' - (correction : not shot, thanks g1) and try not to repeat anyone.

    There's also an advantage a tube amp has in handling picked or strummed...
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    I use a real tube amplifier and I also use some...

    I use a real tube amplifier and I also use some digital gear at the same time, and here's what I've done :

    Carry along a smallish super light JBL self powered PA cabinet along with my tube amp.
    ...
  6. Today I removed the 350ohm cathode resistor and...

    Today I removed the 350ohm cathode resistor and put in a 250ohm one in it's place. The original 200ohm factory resistor was actually 219ohms, so I decided upon the 250ohm as a good compromise to just...
  7. LOL, I should have read your excellent suggestion...

    LOL, I should have read your excellent suggestion before I took apart the amp today ! I found a suitable 350ohm cathode resistor in all my junk and put it in, but it's quite easy to take out again....
  8. Just got a strange thought... The amp is a combo...

    Just got a strange thought... The amp is a combo and this is not an ideal situation when it comes to cooling, as heat rises and can actual get caught in the pocket at the top of the amp, and get...
  9. It is biased pretty hot currently. The stock...

    It is biased pretty hot currently.

    The stock Supro (Valco) cathode resistor is 200 ohms, and I am sure that was ok for 115vac back in the 40's, but my outlet today is 125vac and sometimes a bit...
  10. Thanks for the responses ! Another question :...

    Thanks for the responses !

    Another question : Any issues with running a slight fan cooling over a transformer ? Not talking about a huge air current, just a small DC fan ? My worry is that I am...
  11. Power Trans runs Cooler when Amp Driven Hard ?

    I apologize for the big gaps in my knowledge, but as always I appreciate any opportunity to learn.

    Do tube amp transformers run a bit cooler in cathode biased amps when you are driving them hard,...
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    Just decided to read some of the comments under...

    Just decided to read some of the comments under the YouTube video I sent the link to. Sounds like there's a bit of controversy swirling around regarding the video. I don't know him from Adam, so I...
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    Mr. Fahey, glad to see your back on-line. Not...

    Mr. Fahey, glad to see your back on-line.

    Not to hijack my own thread, but I heard there was a huge power outage, not unlike the one on the east coast of the USA many years back.
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    I too am more impressed by an amps actual...

    I too am more impressed by an amps actual performance, and less by just wattage, as I know speaker efficiency, cabinets, and the chosen frequency curve exert a tremendous influence on the attainable...
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    Amp Wattage Measurement - Approximations

    Saw a video several months back and a gent claims you can measure the A/C voltage from your speakers with a multi-meter, measure the ohms of the speaker(s), and then use Ohms law to approximate the...
  16. UPDATE : Ok, left feeling pretty stupid with...

    UPDATE :

    Ok, left feeling pretty stupid with this one !

    I just checked the green wire attachment to the amp again using an inspection mirror and a flashlight, and I believe it's connected to...
  17. I have to get a scope ! The one end of the green...

    I have to get a scope ! The one end of the green wire is to one of the first speaker terminal, the other end is to the strip that connects the output transformer to the plates and the center tap...
  18. No Field coil on this amp. Three wires from ouput...

    No Field coil on this amp. Three wires from ouput transformer to the amp, and two from the output transformer to the speakers... But as you see there is another wire, a green one that runs from one...
  19. I did measure it when I first got the amp, but it...

    I did measure it when I first got the amp, but it didn't get logged as it was ok and I was in a rush... mistake not to do that.
  20. I do have a confession to make that may explain a...

    I do have a confession to make that may explain a little more... There is a "Fourth" original Green primary side wire on this amp that get's hooked to the positive green speaker terminal...

    Not...
  21. Sorry I probably wasn't clear and mixed two...

    Sorry I probably wasn't clear and mixed two concepts together. The new output transformer is running very cool, it's the power transformer that seems to be running a bit hotter at an idle.

    Just...
  22. New Output transformer - Need to Change Tube Bias ?

    I have a suspicion it might, but please school me on this, as my understanding of output transformers is limited.

    Recently I replaced a stock National 1224 Valco output transformer with this one :...
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    It's a complex issue, because wattage reduction...

    It's a complex issue, because wattage reduction is not related linearly to sound perception. Include Equal loudness curves and the frequency amplitude perception that occurs at high volume, and you...
  24. I would buffer their expectations and start at...

    I would buffer their expectations and start at $89 :)

    Same thing happened to TV and radios years ago when transistors stepped in, unfortunately.
  25. Glad you brought that up justin. Often...

    Glad you brought that up justin. Often overlooked, but shouldn't be !

    Some recent amps with PC mounted sockets and other cost cutting components / assembly have had some serious popping and...
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    Output Transformer - 4 wires ?

    National amp output transformer has normal Brown, Red, & Blue wires on the power tube side, but on the speaker side there's another green wire running from the speaker output back up the amp. I...
  27. I will call Weber, but I've never seen a recone...

    I will call Weber, but I've never seen a recone kit after quite an extensive search and heard of many owner in my same boat.

    The 6" x 11" Rola is an odd one, and the only thing I've found even...
  28. New Valco Output Transformer - 6V6 Push Pull - National 1224

    Recently purchased a National (Valco) push pull 6V6 amp and the twin 6" x 11" oval speakers. The speakers have seen better days ; They still work but by the sound of it, they are very worn and have...
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