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    Cooling Fan Math and Concepts

    Nice article from Digikey.

    I knew just a little about this, after reading I now know a bit more.

    Enjoy.
    ...
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    I agree with Leo, the amp is the best place to...

    I agree with Leo, the amp is the best place to test, as all the variables that go into a pair of tubes operation are in the amp when it's running. If you can find a tester that can do that, then you...
  3. One thing that I thought was overkill is the...

    One thing that I thought was overkill is the analysis of acceptable Temperature for a power transformer as presented by some aftermarket manufacturers.

    I currently own about (sorry lost accurate...
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    My Uncle worked loading coal as a kid, packed...

    My Uncle worked loading coal as a kid, packed powdered asbestos around oil burners for 40 years, smoked Cigars for 50 years, and still lived to be 88 years old without any lung issues at all.

    Not ...
  5. Hear Hear ! A smart man is one who knows when...

    Hear Hear !

    A smart man is one who knows when when to ask for help, and has the courage to ask questions, and the tenacity to finsh the job, and you did all that.

    I still find myself hesitating...
  6. I have several valco amps using 6973 tubes (not...

    I have several valco amps using 6973 tubes (not 6L6s), and using a slightly bigger Cathode resistor didn't change tone all much, but put the ouput tubes in a safer region. I think in the amp world...
  7. I just had a can cap short recently on a much...

    I just had a can cap short recently on a much more basic and older amp, and it was at first very preplexing to me, but easier to diagnose than in your particular case, because the old 1957 Zenith amp...
  8. Excuse my relative inexperience if these...

    Excuse my relative inexperience if these questions are too basic, or if you already covered these tests or types of tests already.

    Did you try to measure the voltage of the transformer with the...
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    Nice and Easy !

    Never realized how easy this was ! I always thought you had to go with a much more elaborate circuit, perhaps including a few caps, resistors, and some type of impedence matching transformer.
    ...
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    $1.50 and hour for doing what you love. Sounds...

    $1.50 and hour for doing what you love. Sounds like a fair exchange in my book ! ;)

    I've run into the same amp tone tuning problems as you before, and I've only just kicked the habit of tuning my...
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    I like that, and amp that plays like a Thermin ! ...

    I like that, and amp that plays like a Thermin ! I could use that at one of my gigs when we are playing the crazy part of Led Zeppelin's "Whole Lotta Love" !

    Usually I just get some feedback and...
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    Sounds like a great evening to me, amps and food...

    Sounds like a great evening to me, amps and food ! As you mentioned there was also some reciprocity going on.

    What I can't stand are people who always ask for help and never reciprocate. Even...
  13. I was dealing with truly awful soft poorly...

    I was dealing with truly awful soft poorly tempered steel cutters and cheap pliers from discount stores until very recently. I rationalized it by thinking that I could buy several for the price of...
  14. It is lower, and I wasn't clear about that in my...

    It is lower, and I wasn't clear about that in my OP, 5U4GB around 440vdc, and the GZ34 around 473vdc. I wanted a higher steady state B+ by using the GZ34 and got it, I also got a welcomed slower...
  15. Sorry, I wasn't clear and mixed two concepts...

    Sorry, I wasn't clear and mixed two concepts together. Thu 5U4GB had a lower operational steady state B+ voltage, from memory around 440vdc, but the GZ34 steady state is around 473vdc. The big...
  16. If the problem re-occurs soon, I would check the...

    If the problem re-occurs soon, I would check the value of the V2 and other further down stream plate resistors. I've had to replace many of those on my vintage amps, and they create snap crackle and...
  17. Working my way through this thread so I will see...

    Working my way through this thread so I will see how it all ended, but G1 your intuition sounds good to me in any event.

    So far I've been lucky with OT transformers or tube shorts, but my bandmate...
  18. Subed with GZ34 Rectifier, Slower DC Voltage Climb

    Recently installed a GZ34 into my 6L6 project amp, and after my usual fashion of obsessing about startup voltages, I measured the ascent of the B+ voltage to see if it came close to my new 600vdc...
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    Thanks, I think with all the responses I...

    Thanks, I think with all the responses I understand that DC cannot break through the gap in the cap, it has to be AC if the cap is functioning correctly, and if the voltage is not too high, and of...
  20. Lol, sorry got my "wires" crossed, the quoted...

    Lol, sorry got my "wires" crossed, the quoted response should have been for you Helmholtz, but as you guys know, I thank you all for your help and fellowship !

    I just accidently deleted my post...
  21. Thanks Eschertron. Read that around 2007, great...

    Thanks Eschertron. Read that around 2007, great and very insightfull book ! I got to that book by being a big fan of J.S. Bach, and basically obsessed by his music.

    The big Oratorios, the Violin...
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    Thanks for the education. I came into...

    Thanks for the education. I came into understanding about pickups very late in my tenure as a guitarist. They can make a world of difference in performance of playing, not just frequency response...
  23. I will find it usefull ! You are correct, the...

    I will find it usefull ! You are correct, the dual lug strip is stock, and I ran another ground wire from the same location, but left the other groudings attached, and that reduced the hum before I...
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    Do capacitors always block DC ?

    One thing that has bugged me for some time...

    When you calculate a really low corner frequency, like using a really big coupling cap, is it possible to go so big that you let DC through ?

    I...
  25. Corner Frequency Shortcut Calculation

    This may be old news already, and it's of small import, so I appologize if it's redundant.

    I started finding it a bit tedious using the f = 1/(2*PI*R*C) equation to find a filter corner...
  26. I have a Hi-Fi (Zenith amp) I converted to a...

    I have a Hi-Fi (Zenith amp) I converted to a guitar amp that has your two problems (cathode bypass cap on V2 kills theTone controls), and Bass control that sounds like a volume control just adding a...
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    I never thought of it that way, but next time I...

    I never thought of it that way, but next time I have to shell out for Pizza for my band, I will think of this. :thumbsup:

    I have thought about every large household purchase in the currency...
  28. Sounds Good ! all your stuff does. Your work...

    Sounds Good ! all your stuff does. Your work speaks for itself.

    It's generally not good to brag and have a big head, but you are good enough that you should feel some level of pride, and don't...
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