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  1. Replies
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    I could be wrong, but I think that is where you...

    I could be wrong, but I think that is where you would see the error signal - the signal the amp uses to correct differences between input and output. Never lose sight of the fact this amp is one...
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    Correct or not I have no idea, but they...

    Correct or not I have no idea, but they pronounced it "hipsh."

    For what it was worth my buds told me teh Maytags were really good machines, very reliable, but once they broke they are a pain to...
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    Dryers? On our coin-op route we used big HEUBSCH...

    Dryers? On our coin-op route we used big HEUBSCH driers. On campus most were steam, and a few gas. Worked well.

    I am not associated with the spammers.
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    Back in 1974-1980 I was in the coin-op amusements...

    Back in 1974-1980 I was in the coin-op amusements industry, but we also had coin laundry routes. We had the MSU campus coin laundry account. All the washers and dryers in the dorms and on campus. ...
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    A lot of tube testers had pin straightener...

    A lot of tube testers had pin straightener sockets. A machined metal socket, you shoved a tube into and it bent the pins back straight and helped unkink them.
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    I think it is simple. You can still buy a used...

    I think it is simple. You can still buy a used Deere A and keep it running. We have people thinking they have to adjust their bias every few minutes or the world will end, and people cry when some...
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    The LEDs likely need very low current, so a very...

    The LEDs likely need very low current, so a very small transformer could power them. I agree to rectify the AC and filter it, but that takes little room as well. Mount the little transformer inside...
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    It is like any complex procedure. Will we be...

    It is like any complex procedure. Will we be seeing it, or was it a one-off? My first PV Classic 30 was a pain, and I spent too long on it. But once done, the next one took just a few minutes. My...
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    either bad cap or broken traces to it.

    either bad cap or broken traces to it.
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    That looks like a missing filter cap. make sure...

    That looks like a missing filter cap. make sure connections to same are sound.
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    Just making sure you were not in Brazil or...

    Just making sure you were not in Brazil or something.

    Let me get to my storage unit and dig them out, we can continue discussion in PMs. I am sure we can reach a deal.
  12. Thread: Tek 5113 scope

    by Enzo
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    Sounds like a deal for someone. MSU also...

    Sounds like a deal for someone.


    MSU also always has a lot of those great old TOA "PA mixers".
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    Hadn't thought about it, where are you?

    Hadn't thought about it, where are you?
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    What do you mean by measuring high? Wirewounds...

    What do you mean by measuring high? Wirewounds pretty much are open or OK. If the 0.27 ohm part reads 0.4 or something, make sure to subtract the resistance of your probe wires. If they measure...
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    A lesson everyone has to learn.

    A lesson everyone has to learn.
  16. Thread: Tek 5113 scope

    by Enzo
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    Tek 5113 scope

    MSU Surplus also has a Tek 5113 scope with four input module 5A14N ( I think) And a couple time base modules that went down to really slow, not sure just which. Asking $75 for it.

    ANyone local...
  17. Thread: EV DH1A

    by Enzo
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    EV DH1A

    Big EV DH1A drivers on some large horn. SImilar to:
    https://reverb.com/item/12204733-ev-dh1a-8-ohm-hf-compression-driver-and-large-horn-assembly

    Three of them at Michigan State Univ surplus...
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    And for that matter, SHure made your cable, but...

    And for that matter, SHure made your cable, but your mic is an EV, I think I might call EV and ask after connectors.
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    I think the CB connector is about 30% smaller. ...

    I think the CB connector is about 30% smaller.

    Suggest: CALL Rapco/Horizon, and ASK them if they still have the four pin screw-on connector for old EV mics like your 664. If so they might sell...
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    These are power amp modules. Two boards mounted...

    These are power amp modules. Two boards mounted to a central heat sink core with a fan on the end. Boards on two opposite sides, transistors on the remaining two sides. Oh, vaguely like HArtke...
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    The entire power amp is one big fed back loop. ...

    The entire power amp is one big fed back loop. Any problems at the output will cause compensating reactions back at the front end.

    Those three resistors are all associated with Q16 and are ALL...
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    I was a Fostex service center, all the manuals I...

    I was a Fostex service center, all the manuals I have are service manuals. The double speed feature shouldn't affect the power supply and related issues.

    https://americanmusicandsound.com/

    You...
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    It is a four pin, but not an XLR, but that...

    It is a four pin, but not an XLR, but that doesn't help you.

    I might heat the sheath with a heat gun, staying back far enough not to melt it. I might wedge small screwdrivers under the edge or...
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    I have the X18 manual somewhere. What is...

    I have the X18 manual somewhere. What is difference from X18H? Mine is in storage, and right now it is too cold and snowy to go over there and root around.
  25. Just a quick check. Nothing left to power up...

    Just a quick check. Nothing left to power up except the power cord, fuse holder, switch, wires. It won't DO anything, but for example I once found a power toggle switch that had an internal short...
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    Um... U3-1 has -2vDC? Instead of -1.6vDC? I...

    Um...

    U3-1 has -2vDC? Instead of -1.6vDC? I don't see that on the schematic. At that pin I see TP10 with 785mvAC. That means signal.


    Please clarify.
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    Helms, I think the transformer has two terminals...

    Helms, I think the transformer has two terminals broken off, so it LOOKS like two wires only, but is a transformer nonetheless.
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    How much do you figure the drop changes? at 9v,...

    How much do you figure the drop changes? at 9v, we see 0.9ma through the diode, at 12v we see 1.2ma. SO would 0.3ma change the drop voltage that much? Not to mention the 10k base resistor in...
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