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I used to have one. It was an octal blank plug that was made to look like a knob when plugged in. It even had a white hash mark on it. I am looking for 2 of them and dont know where to buy them??
Follow Ups:
Do you mean an 8 pin tube plug ? Where does "knob" fit in the description? You mean it is an 8 pin tube plug (male not a female socket) that is painted or decorated to look like a knob? Not quite sure what you mean. Finally is it something that is inside a piece of gear or outside? If you just mean an eight sided knob see the link below
ET
It is a blank octal plug that was made to look like a knob. I used to use it in my power amp where a preamp would have plugged in to get power. I guess it would not be too hard to make. It just looked better to me and the nephew cant stick anything in the pin holes.....
The power supply outputs were used to power the preamps and had no wiring needs if not used. You could just buy a plug and. FILL the pins with glue or such if you are nervous about little fingers. Sometimes the makers shipped them originally with a plug, sometime just a dummy that could not be used or an empty that could be wired.
Don Brian Levy, J.D.
Toronto ON Canada
OK now I understand but often it isn't just a blank plug more often some of the pins are shorted together internally where you can't see them to carry out an action. I have a radio that doesn't power up unless you put one of those in an octal socket in the rear of the radio and pin 2 must be shorted to pin 7 for it to work. What piece of gear is it? Perhaps there is a schematic that will tell us.
ET
I dont know what it came out of originally but I used it in a Fisher 20A and it likely didnt have any shorted connections or at least not on the pins that the fisher had connections on...
I see it but you need to give the make and model number before I can tell you what you need. Some of the pins need to be connected together internally via the plug or the amps would work without them plugged in. My Eico HF-60's had them too I think.
ET
Do you run your system on the variac? If so, are there any drawbacks?
Certainly the simplest way to deal with over voltage due to 115 volt transformers.
.
Freak out...Far out...In out....
Yes, I don't notice any drawbacks to speak of. The amps run cooler and I don't worry about burning my favorite stuff up (like I did a few years ago)..!
it would help to know what I was looking for
two sources
http://www.ehcknobs.com/pdfs/catalog/InstrConsp34.pdf
http://www.alliedelec.com/hardware/dials-and-knobs/
No, I've never seen such a thing... but I would think it would be straightforward to make something like that using an octal plug and an appropriately sized knob. A hacksaw (or coping saw) & some epoxy would likely be required :-)
octal plug:
https://www.tubesandmore.com/products/P-SP8-476
'appropriate' knob :-)
https://www.tubesandmore.com/products/P-K349
(see link below as well)
all the best,
mrh
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