Cloth leads

for Dynaco Mark II/III/IV and DIY PP monoblocks

Cloth leads

Postby Blair » Sun Jul 19, 2015 4:58 pm

Is there something that can be done to soften the insulation again? I got a pair of intact MKII amps for a crazy price, but they need cosmetic attention. I took one apart already, but the leads are all super crackly sounding when I flex them.

Thanks!
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Re: Cloth leads

Postby Geek » Mon Jul 20, 2015 2:12 am

Nope. At least not safely :(

These guys have it, though: http://vintagewireandsupply.com/
As well as AES.

Cheers!
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Re: Cloth leads

Postby Blair » Mon Jul 20, 2015 8:28 pm

I had some cloth wires. Not original colors, but I made a chart. It's pretty scary opening up the transformer like that.
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Re: Cloth leads

Postby battradio » Mon Jul 20, 2015 10:15 pm

You can always get long thin shrink tubing and cover them .
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Re: Cloth leads

Postby Blair » Tue Aug 11, 2015 5:07 pm

Thanks guys!

I ended up cutting into the transformer and replacing the leads.

I do have a question. In the poseidon schematic, the VA stage feeds the 12 AU7 through pin 7. Pin 2 is grounded. Can I reverse those? I see no reason I can't, but I figure is ask. It would just work better for my layout to use 2 as a tie in for the coupling cap.
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Re: Cloth leads

Postby EWBrown » Tue Aug 11, 2015 6:55 pm

Reversing the input pins 2 and 7 would also reverse the phase, so the LTPI's output leads to the power tubes' control grids would also have to be swapped, in order to prevent the NFB from becoming positive feedback, and turning the amplifier into a power oscillator.

/ed B .
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Re: Cloth leads

Postby Blair » Wed Aug 12, 2015 2:58 pm

Thanks Ed!

I figured as much. Now, I want to rewire the other one because it made the layout better.
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Re: Cloth leads

Postby TerrySmith » Thu Aug 13, 2015 8:12 am

Heat up the cloth leads with a heat gun or hair dryer and they usually get real flexible. Heat again when you reassemble and they will stay put after they cool down. HTH!
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