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  1. Replies
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    That's exactly it - my end goal was to be...

    That's exactly it - my end goal was to be reassured that in this specific situation, this would not divide any signal and bleed it off ... as, I don't know - heat perhaps. I didn't think so, however...
  2. Replies
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    171

    Generic voltage divider question...

    Hello Fine Folk of MEF.

    I have a question about voltage dividers... or perhaps not :confused: ??

    To properly relay my question I have created a very fancy aid... please consider the following...
  3. According to the datasheet that Pedro linked,...

    According to the datasheet that Pedro linked, this relay is a form c. And so I gather that the switch I choose MUST be of form D, make before break, correct? It makes sense as such.

    Thanks.
  4. Thanks very much! I'm splitting time between a...

    Thanks very much!

    I'm splitting time between a few amps atm and when I find some time I will seek out the proper switches etc to realize this amp switcher. I could have REALLY used it today, two...
  5. Sorry, Fellas - I am not experienced enough to be...

    Sorry, Fellas - I am not experienced enough to be comfortable with "experienced amp guy vernacular" - of course I say that in a nice way - so when you say "to put a resistor across the amp speaker...
  6. Thanks! I have a 'real' 1959 and would sound...

    Thanks!

    I have a 'real' 1959 and would sound great if it didn't have the sound of wrinkled paper with palm muting. I like this amp more - but it's only a few things that differ... I'm even using...
  7. I did some digging around - there is apparently a...

    I did some digging around - there is apparently a common issue - it was about a month and a half ago - I can't recall why I didn't move forward with it - but I do have the manual with the hundred...
  8. oh yea, 2203 mode... I mostly keep it set up as...

    oh yea, 2203 mode...
    I mostly keep it set up as a 1959, but once in a while I need something with a bit more headroom for palmy mutes etc...

    55558

    this is gain and mast vol on 7, presence on...
  9. haha - i used to play at a place called the bee...

    haha - i used to play at a place called the bee hive when i was a teenager.

    55557

    Here's a short clip... let's see... this is in 1959 mode, everything on 10 except the volume on 7'ish. the cab...
  10. ... and I kept meaning to say, my Tektronix 465...

    ... and I kept meaning to say, my Tektronix 465 has recently stopped giving me a trace :-( - time for finding something else I guess.
  11. Found it.... pffffffff... after tearing out all...

    Found it.... pffffffff... after tearing out all of the 10k dropping resistors to make sure they weren't 100Ω. And that was like after 5 hours of scratching my head.

    BUT, it was the negative side...
  12. i have 225VDC on pin 1 of v1.. I don't think...

    i have 225VDC on pin 1 of v1.. I don't think thats right so I am triple checking the filtering all through the chain.
  13. okay - here are some pics, from my iphone, as...

    okay - here are some pics, from my iphone, as fast and high res as I could get without busting out a DSLR.

    55549
    55550
    55551

    the power section is a bit messy with the way the filter cans are...
  14. Cranked I will post a pick, but it is...

    Cranked





    I will post a pick, but it is a 1959 circuit with a switch to add a 2203 cascade - in the clip it's a standard 1959 bright channel, all knobs on 10 except bass. It seemed to...
  15. DIY 1959 with horrible ... distortion? oscillation? not sure WHAT it is!

    Hi.

    I'm back with a terrible noise that I just can not seem to find.
    I just finished an amp this morning. Powered on w/out load, took some measurements, all fine. Added tubes, took...
  16. Awesome - thank you! And now that you say it,...

    Awesome - thank you!

    And now that you say it, it makes sense!!!!
  17. Dumb, yet important, Power Transformer wiring question.

    Hi.

    How should the following 100 watt Dagnall power tranny specs be interpreted?

    0V Black
    175V Yellow
    350V 300mA Brown

    Is the brown the CT in this case? Or the...
  18. I'm trying to follow but I do not see a reference...

    I'm trying to follow but I do not see a reference to a specific wattage in the RCA tube manual - or are you referring to the mullard data sheet?


    Sorry, that is the term that stuck with me - but...
  19. Does this include that the 100 watt version...

    Does this include that the 100 watt version requires the use of a "voltage doubler" to get up to +/-494 VDC - or am I blowing smoke out of my ass and totally not understanding any of this? haha. I am...
  20. Sorry, RC-30 is the 1975 RCA Receiving Tube...

    Sorry, RC-30 is the 1975 RCA Receiving Tube Manual - RC-30 is the revision.

    Just out of curiosity - what is your datasheet resource? I always to to the RCA tube manual. But of course if I remember...
  21. Yea, sorry - I was referring to EL34, but I am...

    Yea, sorry - I was referring to EL34, but I am working on an amp that has 6L6GC ATM, so I was reading both pages in the RC-30. I pointed out 6L6GC because zero-signal to max-signal nearly doubles,...
  22. Current Ratings for amp and Power Transformers

    Hi Everyone (who reads this :-) )

    Something, for a long time, has befuddled me to a point that I ignored it... until now. That is current ratings of power transformers and as a secondary topic,...
  23. Replies
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    1,290

    Awesome, and I didn't know that without heater...

    Awesome, and I didn't know that without heater failure that the tube would still conduct the already rectified (from ss) power.



    All covered there. ATM the amp is setup similar to a dual...
  24. Found it... He's demoing A/B'ing one of his...

    Found it... He's demoing A/B'ing one of his 12,000 series heads

    https://www.youtube.com/watch?v=Fcabc00kZ7w

    He seems to have faith in the switcher, especially switching with an original 1968....
  25. Well it all sounds dangerous for the amps. I'm...

    Well it all sounds dangerous for the amps. I'm not sure if I have enough faith in components to feel confident that this would work in a long term.

    I know George Metropoulos has/used to have one,...
  26. Replies
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    1,290

    I must resurrect this thread and ask for...

    I must resurrect this thread and ask for clarification here...

    Seņor PDF64..... I wonder at the moment if I missed your first post initially, so I will ask for an expansion here to follow...
    ...
  27. Well said. Yes, you'd be correct - I am, at...

    Well said.

    Yes, you'd be correct - I am, at this moment, more interested in the best amp design. Two switches is not an issue. However I wouldn't mind having the more "involved" plot for later use...
  28. Noted, and thanks! I figure later that the finder...

    Noted, and thanks! I figure later that the finder didn't have enough to take the current. I will look into your recommendation.

    On a side note - What happens in the even of a catastrophic error...
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