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  1. 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...
  2. 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.
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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.
  9. 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...
  10. 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...
  11. 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...
  13. 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.
  14. 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...
  16. 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...
  17. 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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    I've always thought you need a fair balance (...

    I've always thought you need a fair balance ( whatever that is !) between knowing music tech and playing straight away. You need both, but depending on the player and what you do, more or less will...
  19. Excellent. Yes, Enzo and several others here are...

    Excellent. Yes, Enzo and several others here are quite proficient and intellectual in their diagnostics, to say the least.

    Glad it was narrowed down through a bisection of symptoms. Best way to...
  20. I'm just going to throw my very limited knowledge...

    I'm just going to throw my very limited knowledge into the mix. I presume you've cleaned the jacks (including ground tabs), pots, and sockets with contact cleaner, and did a visual check for all the...
  21. Sorry, that schematic is the only one for my amp...

    Sorry, that schematic is the only one for my amp (that I've found) and it's got some serious flaws !

    Yes there is a heater ground and it's connected to the cathode resistor to elevate the...
  22. Thanks, will do. I have to hide the 'new' scope...

    Thanks, will do. I have to hide the 'new' scope from the wife :).

    Just bought another old National amp a couple of weeks ago, and she wasn't happy, But You gotta do what you gotta do !
  23. Yes, I did swap out the good Jensen C10Q s for...

    Yes, I did swap out the good Jensen C10Q s for Celestion Greenback (10") speakers. Same thing, but I read that could be the cause as well. Thanks.
  24. Might be, you just reminded me that when I back...

    Might be, you just reminded me that when I back off on one frequency with my parametric EQ, right around 550hz give or take, the ghost notes are diminished, and at super high gain is sounds like it's...
  25. That is correct replaced all the big caps, and...

    That is correct replaced all the big caps, and added some capacitance actually to the first node, from 20uf to 40uf.

    But I've also changed things a bit, so I won't rule out not having enough...
  26. Ghost Notes - Use Scope to Track down ?

    I love my Gretsch 6162, but sometimes I hear faint ghost notes on the decay of high notes when the gain is pushed with a boost up front (top 3 strings above 12th fret). When playing with a band, they...
  27. No I didn't before, but now I will !

    No I didn't before, but now I will !
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    Me too. I looked at the ridiculously small...

    Me too.

    I looked at the ridiculously small price of resistors and coupling caps and the availability of parts over the internet and thought "All you need to do is to buy a multi meter, respect...
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