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  1. Replies
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    Here they are, pre and power amp. 47822 ...

    Here they are, pre and power amp.

    47822


    47823
  2. Thread: Schemo search

    by DRH1958
    Replies
    1
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    279

    Try this link:...

    Try this link: http://audiophool.com/Schem_A/Stromberg_SAU-10_Sch.gif Also, if you click on this link, there's tons of schemos for S-C equipment at the bottom of the page:...
  3. Thread: Tube ID?

    by DRH1958
    Replies
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    1,033

    Another trick is to fog up the glass by breathing...

    Another trick is to fog up the glass by breathing on it. This sometimes reveals very faint markings.
  4. Thread: Tube ID?

    by DRH1958
    Replies
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    1,033

    Or 5R4WGB. 44047

    Or 5R4WGB.


    44047
  5. Replies
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    Check to make sure the fuse is the same value and...

    Check to make sure the fuse is the same value and type as specified on the amp next to the fuse holder.

    Also, as long as you're checking conditions around the filter caps, maybe check to see if...
  6. Thread: Zener diode

    by DRH1958
    Replies
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    3,867

    As a matter of fact, we WELCOME newcomers as a...

    As a matter of fact, we WELCOME newcomers as a general rule. But we also are looking for people who can read the posts, interpret them and THEN offer solutions within the guidelines of the Original...
  7. Thread: Zener diode

    by DRH1958
    Replies
    56
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    3,867

    Good eye. Pretty sure it's from the G-15. I found...

    Good eye. Pretty sure it's from the G-15. I found it in this thread on AX84's site. The first post refers to the "Ampeg G-15 B+ too high thing" and when you click on the second link, the new tab that...
  8. Thread: Zener diode

    by DRH1958
    Replies
    56
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    3,867

    Just to clarify things Juan, since he has already...

    Just to clarify things Juan, since he has already ordered those 10W 30V zeners as stated in post #29, could this work? Is this what you were getting at, at least in theory? Put the zeners in the B+...
  9. Thread: Zener diode

    by DRH1958
    Replies
    56
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    3,867

    Did you retain the fixed bias method when...

    Did you retain the fixed bias method when changing over to 6BQ5 tubes? The Brown Princeton (6G2 model) shows that it has a fixed bias supply is taped off the main secondary winding. Since this...
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    If you do come across this book at a decent price...

    If you do come across this book at a decent price (not $1800 on Amazon:surprised:) I feel it's worth it. I do have it and it's very informative with few errors, IMHO. On an earlier version of his...
  11. Yep. That's the rest of the story, IMHO.

    Yep. That's the rest of the story, IMHO.
  12. I have the same problem with an old Bell PA amp....

    I have the same problem with an old Bell PA amp. I've done some reading and think I might have figured it out. These amps have a cathodyne PI and when the power tubes are overdriven, they draw grid...
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    I would hope that an amp arriving basically...

    I would hope that an amp arriving basically non-working would merit some form of compensation at least monetarily so you can look for a different one. It's not like you got it off Craigslist with all...
  14. Replies
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    Have you ever taken either of these amps apart?...

    Have you ever taken either of these amps apart? The circuit boards are folded up three sided with jumpers connecting the three boards and are a PITA to work on. These jumpers tend to loosen up when...
  15. Replies
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    This book has a couple of amps with that size...

    This book has a couple of amps with that size chassis (he uses a 2" deep instead of 3") including a Bassman. It has the chassis dimension layout for punching your holes, circuit board layout, bill of...
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    I've always thought ~10-20mV leakage is fine or...

    I've always thought ~10-20mV leakage is fine or will not adversely affect the signal voltage appearing at the input of the next stage and it just so happens that 1% of 1.5 volts = 15mV, so 10-20 mV...
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    Sorry, I forgot to look at that link as I was...

    Sorry, I forgot to look at that link as I was going to respond to it. Trainwreck amps use this 6.6k OTs because it can run 6V6s and EL34s. That 6.6k impedance value is halfway between the 3.4-4k for...
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    No, when you look on the data sheet under...

    No, when you look on the data sheet under "Push-Pull Class AB1", I abbreviated this. In addition notice it says "for two tubes" So by looking there you have already determined that you have two tubes...
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    Or we could look at the data sheet: ...

    Or we could look at the data sheet: http://www.mif.pg.gda.pl/homepages/frank/sheets/093/6/6V6GT.pdf Look on page two under "push-pull class AB1" then "Effective Load Resistance". Normally (if there...
  20. Replies
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    I heard this as well. Listen at 1:19. I wanted to...

    I heard this as well. Listen at 1:19. I wanted to post this yesterday but my computer crashed.
  21. I would think your Mesa Boogie preamp would work...

    I would think your Mesa Boogie preamp would work fine if it has two 12AX7 gain stages that are cascaded. The original schematic you posted has this configuration for the second channel. If you need...
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    I would think those .001uF caps would be fine. I...

    I would think those .001uF caps would be fine. I wouldn't think that low value would cause blocking by themselves. Many amps have either .01,.02 or .047uF for this duty. That's what I use and have...
  23. Thread: The end...

    by DRH1958
    Replies
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    4,375

    IMHO, this is one of the best things we can do,...

    IMHO, this is one of the best things we can do, passing the knowledge on to others in a hands on way. I answered a local Craigslist ad for "can anybody help me convert this amp into a guitar amp?" I...
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    Farting out is blocking distortion which is...

    Farting out is blocking distortion which is largely a function caused by too large of value of coupling caps between the PI and power tubes. Reducing the value of these plus adding around a 10k grid...
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    One additional thing to add to Chuck's great...

    One additional thing to add to Chuck's great advice, use the type of cleaner that does NOT leave lubrication behind. That type is for pots, etc. Make sure you get the type that evaporates completely...
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    I wouldn't operate the amp for now mostly because...

    I wouldn't operate the amp for now mostly because of such low heater voltage but also because you don't really know what voltages you have for sure with the cheap meter. All other voltages will be...
  27. I found an interesting item in one of my books...

    I found an interesting item in one of my books when doing more research on the EF86. It had the exact input of the Vox AC 15 as the example and it showed a supply of 255 volts, plate resistor of...
  28. Do you have the grid referenced to ground right...

    Do you have the grid referenced to ground right now like the schematic shows? Any common cathode gain stage needs the grid connected to ground by some resistance. So I'm guessing that this is...
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