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  1. What are MBB power relays ? I tried running...

    What are MBB power relays ?

    I tried running two 5E3 type amps into a stereo wired Marshall 4x12. Caused some kind of oscillation problem, but only when a note or cord was being played above a...
  2. My reasons for doing something like this are...

    My reasons for doing something like this are slightly different. I want to set up an experiment to see if people can tell the difference between two amps, one tube and one solid state. The problem I...
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    The reason you get a pop when you throw the...

    The reason you get a pop when you throw the switch is that there is DC on the feedback path that gets shorted to ground by the output transformer.

    Edit: Peavey used the same idea on their amps...
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    Does this version have a Hum Balance pot ? Is...

    Does this version have a Hum Balance pot ? Is this more of a buzz type hum, or a low Organ note type hum ? Check the pot if it's the low organ note type.
  5. I'm not sure, but shouldn't x-rays be effected by...

    I'm not sure, but shouldn't x-rays be effected by magnetic fields ?
  6. I bought a pair of Electrovoice EVM-10s on ebay....

    I bought a pair of Electrovoice EVM-10s on ebay. When they arrived, both needed to be re-coned because they had rubbed together. Judging from the condition of the package and conversations with the...
  7. I don't see the numbers you quoted for the GZ34...

    I don't see the numbers you quoted for the GZ34 on the data sheet you linked, and it would be a better idea to quote the numbers from the 450 VRMS column so you are comparing apples to apples. In...
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    What safety approval logo's does the amp have ?...

    What safety approval logo's does the amp have ? UL, CE et al ...
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    I was doing sound for a jazz band with a 3 piece...

    I was doing sound for a jazz band with a 3 piece horn section. A bar tender at one particular bar complained that the band was too loud. I went out and purchased a SLM from Radio Shack, the very...
  10. I've been looking over at Amp Garage and you...

    I've been looking over at Amp Garage and you can't search for "PCB". There are a couple of hits for "Printed Circuit" and a couple of pics came up for "layout". The ones I saw weren't very good. One...
  11. It's been a while, but there were some pics of...

    It's been a while, but there were some pics of layouts like this on Amp Garage. IIRC it was a Trainwreck clone.
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    If the RCA tube manual RC-28 is to be believed,...

    If the RCA tube manual RC-28 is to be believed, the maximum grid #1 circuit resistance for fixed bias operation is (not a typo) 0.05 MegOhm per tube. This is especially important at high plate...
  13. Sticky: An output transformer can have significant...

    An output transformer can have significant capacitance between one end of the primary and the secondary. If you were to play a loud cord, hold the cord touching the strings on the guitar, and touch...
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    Too much stuff running from the "D" node. You...

    Too much stuff running from the "D" node. You need another filter cap and resistor to make an "E" node for the first stage.
  15. 3K is a standard value for 5% parts as is 750....

    3K is a standard value for 5% parts as is 750. Fender used 10% parts for the most part.
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    A lot of people in Italy take the month of August...

    A lot of people in Italy take the month of August off. You might not get a reply from them for a couple of weeks.
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    You want a real professional level scope, not a...

    You want a real professional level scope, not a toy or hobby scope. A real scope will have:

    BNC connector for the input.
    Input will be marked 1 Megohm and an input capacitance usually between...
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    OK, it plays tomorrow around 1:00PM NYC time. I...

    OK, it plays tomorrow around 1:00PM NYC time. I can't find any replays in the next week.

    Link to TBD's schedule: http://tbd.com/schedule
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    I've been watching the website, http://tbd.com/...

    I've been watching the website, http://tbd.com/ and it says Sound City is scheduled to play on Friday Aug 16 at 1:00PM Eastern time (New York City) which is 12:00PM (noon) Dallas time. If you are...
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    Most people don't realize you can use the primary...

    Most people don't realize you can use the primary of a transformer as an auto-transformer (within reason !). You can even use a small filament transformer the same way as the pilot light is connected...
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    If the power transformer simply has taps for...

    If the power transformer simply has taps for 240V, 220V, 120V, 100V you simply hook the pilot lamp between 0V and the 120V taps. Then it gets 120V no matter what tap the Mains is connected to. If the...
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    Holy crap, is Peavey moving to China ?

    Holy crap, is Peavey moving to China ?
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    Yes, Sound City did have a good drum sound. The...

    Yes, Sound City did have a good drum sound. The main room was not quite rectangular. The control room window was maybe 10 degrees off on the floor plan. On some of the Tom Petty shots you can see...
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    Sound City, the Studio

    There is a documentary (titled Sound City) about the legendary LA studio, Sound City. It plays on a weird TV station, TBD about every two or three weeks. In Dallas it's over the air station 47.4 but...
  25. I'm wondering about the 100K Mid pot. Was that a...

    I'm wondering about the 100K Mid pot. Was that a Stevie Ray thing ? Is it documented anywhere ?
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    There is a later version of the YBA-1 (and...

    There is a later version of the YBA-1 (and presumably YBA-1A) that deviates from the 5F6A formula. It dispenses with the cathode follower for an extra gain stage and has a 1 Henry inductor in the...
  27. What are you using for an output transformer ? If...

    What are you using for an output transformer ? If it has multiple secondary taps, are you using the 4 Ohm tap ? The 56K feedback resistor is not appropriate if you are using the 8 or 16 Ohm tap. Use...
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    Grid wires to output tubes look OK to me. When I...

    Grid wires to output tubes look OK to me. When I do a layout for an existing board, I get a big sheet of paper and use the board to mark where all the eyelets are :)
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