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  1. I'll check that thermal switch. Thanks. Of...

    I'll check that thermal switch. Thanks.

    Of course i reconnected those caps. I could see making them smaller to increase the high end sparkle. Might do it.

    It's the stand-alone head, but I'm...
  2. Well, not if you see where they are in the...

    Well, not if you see where they are in the circuit. It's as though they wanted to make sure that ultrasonic noise doesn't have a path to ground.

    52421
  3. Battle-scarred, floridian GK 400RB-III, some questions

    Gambled on an "as is, taken from working environment (yeah right)" GK 400RB-III bass head. It was cheap and I'm patient.

    So far I haven't hooked up a speaker or instrument, just to be safe.
    ...
  4. Rebuilding / upgrading a Roland MX-5 stereo 4-channel desktop mixer

    I bought one of these years ago at a university surplus sale. It was always really hissy and at the time i was intimidated by the weirdness of SIP opamps and the sheer number of components in it.
    ...
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    "brown mylar" should actually be polyimide aka...

    "brown mylar" should actually be polyimide aka kapton, which is a lot more temperature stable than polyester/mylar.

    I've soldered thin wires and even smt resistors to them at ~315c after...
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    I find that Fe3O4 has better tone. It's harder to...

    I find that Fe3O4 has better tone. It's harder to make, because it only forms in an oxygen-poor environment.

    A few comments about rust and transformers.

    That evap-o-rust stuff works, and it...
  7. Schematic for Cortez / Kingston / Westheimer Importing IC-281TR / IC-182R combo

    Hit the market in the late 60's allegedly. The IC-281TR is an 8x2 with tremolo and reverb, the IC-182R presumably a single speaker with just the reverb.

    Straight from the inside of the back...
  8. Would be helpful if they gave the length of time...

    Would be helpful if they gave the length of time it can output a given power level at a given thd+n with some power supply specs. I agree.

    Thankfully most people don't listen to continuous sine...
  9. So, after double checking for errors in my...

    So, after double checking for errors in my assembly, would it be reasonable to reduce the value of R30 to increase the reverb mix?

    Edit: or, I guess, increase the value of R29 to increase the gain...
  10. well it doesn't work at all the other way

    well it doesn't work at all the other way
  11. So with regard to switch mode amps you're a...

    So with regard to switch mode amps you're a non-believer. Noted.

    My personal experience has been that their advances in efficiency are pretty effective. Clarity and ease on the ears in "real...
  12. Got it all completed. It works, but the effect is...

    Got it all completed. It works, but the effect is pretty limited. It's an extremely subtle reverb.
  13. There is a ca3080 opamp on the board, but no...

    There is a ca3080 opamp on the board, but no compressor control on the panel. *shrug*. Google hasn't turned up any KMA-65 or KMA-100 schematics.
  14. Well yeah. In some sense, a guitar speaker or...

    Well yeah. In some sense, a guitar speaker or guitar cabinet is an expensive tone control. There's a blog out there somewhre, don't have the link handy, where someone graphed the response curves of...
  15. Depends on your definition of "tweeter". A lot of...

    Depends on your definition of "tweeter". A lot of PA horns are crossed over at 1khz. Even a bass guitar has harmonics as high as 4khz.

    The original piezo horn might work but it was always...
  16. Recommend a discrete guitar preamp to install in front of a class-D power amp?

    A few weeks ago i bought a distressed Kustom KM-100 keyboard amp at a thrift store for five bucks.

    It's popping fuses and i presume that the TDA7293 chip amp is toast. "100w mosfet" was...
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    I give designers plenty of credit, but I'm aware...

    I give designers plenty of credit, but I'm aware that the budget of time and materials for the design phase can be very restrictive, and that a lot can change between design and manufacture....
  18. Yeah, that looks like the one. Similar to the...

    Yeah, that looks like the one. Similar to the blue tank, just not enclosed.

    These don't seem to be available in small quantities. Well, not at reasonable prices anyway. Belton will ship them EMS...
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    The lore about capacitors is endless, but there...

    The lore about capacitors is endless, but there is only one real truth: The only way to know what a capacitor sounds like in a given circuit is to actually try it.

    The Accepted Wisdom is that...
  20. Anyway, thanks all for the help. It's almost...

    Anyway, thanks all for the help. It's almost done, and entirely with parts i had laying around.

    At this point it's a 150pf cap and some wiring and hardware work from done. The only really BS part...
  21. Yeah I've seen the perfunctory 12ax7 designs. ...

    Yeah I've seen the perfunctory 12ax7 designs.

    I guess with tube power you still have the reality that when you drive them into clipping they still sound good. It's just that you can do a kilowatt...
  22. IC preamp and tube output always seemed like an...

    IC preamp and tube output always seemed like an odd choice to me. Unless it's single-ended output, in which case you'd be getting some good even-order harmonics. Which would be destroyed by a...
  23. Point taken. Thing is, I have an academic...

    Point taken.

    Thing is, I have an academic interest because i have a back-burner project to design a high quality stomp box that will drive an outboard reverb tank. Probably based on rod elliott's...
  24. Aren't the number of turns and the impedance...

    Aren't the number of turns and the impedance fairly closely related?

    R25 seems to be equivalent to ESP's R2, and R26 with ESP's R7.

    His suggestion that the resistor in parallel with the drive...
  25. FWIW, though I'm pretty sure I'll be using the...

    FWIW, though I'm pretty sure I'll be using the 1EB2C1B now, it appears that they are using current drive similar to Rod Elliott's article here:

    http://sound.whsites.net/articles/reverb.htm

    So...
  26. Ahh, excellent! Thank you! Saves me tracing it. I...

    Ahh, excellent! Thank you! Saves me tracing it. I hadn't found reference to the K-30X. Duck Jean Enterprise Co? wild.

    The other tank i have on hand is a 1EB2C1B which seems to be a budget version...
  27. Meh. There's something about mechanical reverb...

    Meh. There's something about mechanical reverb that will never be simulated.

    I have enough fx processors to have learned that they are awesome, and range from swiss army knives to leatherman...
  28. Well, you could use three tl072 in parallel, and...

    Well, you could use three tl072 in parallel, and i am not surprised that it has been done, but a 4556 can drive 70mA into 150 ohms without breaking a sweat. The reverb tank needs maybe 20mA.
    ...
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