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Old 5th December 2012, 05:02 AM   #61
freax is offline freax  Australia
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a thing of beauty, well done!!!!

I see you are using coax for the run from the rear rca sockets to the front volume control, ever considered using a thicker gauge copper core coax?

The center conductor looks a little on the thin side, rg-59?

Not that it matters much.

It just seems to be a bit of a waste to have so much copper bus running around and then use cheap grade coax for the run to the front volume control.
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Last edited by freax; 5th December 2012 at 05:09 AM.
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Old 5th December 2012, 05:08 AM   #62
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Quote:
Originally Posted by freax View Post
a thing of beauty, well done!!!!

I see you are using coax for the run from the rear rca sockets to the front volume control, ever considered using a thicker gauge copper core coax?

The center conductor looks a little on the thin side, rg-59?
thanks very much! basically that coax was what i had on hand, i think it was from an old oscilloscope probe lead, so i figured it had to be well shielded. probably overkill. the conductors are indeed tiny but i can't imagine it would make a difference at the tiny signal current at the input..?
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Old 5th December 2012, 05:15 AM   #63
freax is offline freax  Australia
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Originally Posted by sorenj07 View Post
thanks very much! the conductors are indeed tiny but i can't imagine it would make a difference at the tiny signal current at the input..?
I wouldn't spend too much on getting some proper coax, but I work on the idea that if something makes a difference and I assume that it won't but it does then I have lost out on an opportunity to improve the sound quality, and for the cost of a few dollars worth of coax, thats a small price to pay for my peace of mind.

Nobody here I think will tell you that by going to a larger copper conductor will make a difference, its a personal preference of mine as I am moving all of my rca connections over to BNC and RG-6 Quad shield coax (not copper coated steel, pure copper.) which has an 18 AWG center conductor.

By removing one last slim remote possiblity of there being a change or reduction on the sound quality by going to BNC and RG-6 Quad for a few dollars I am ensuring that the signal gets the best possible chance to make it into that tube and be amplified.

I'm not the type of person to go out and buy $50,000 dollar cables, RG-6 Quad pure copper core is where I draw the line and I cut and crimp my own BNC RG-6 cables.

If I can prevent $50 from going to corrupt cable companies by promoting the use of home-made BNC and RG-6 quad then my work is done, $50 could get you 100 metres of rg-6 and 6 or more bnc rg-6 connectors.

But then again as you said its what you had laying around.
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Last edited by freax; 5th December 2012 at 05:36 AM.
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Old 13th January 2013, 11:02 PM   #64
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One of the Chinese 6L6GCR's blew. Now I've got a quad of JJ/Tesla 6L6GC's singing along and all is well. Still contemplating some global feedback but things are sounding pretty Ok without.

final schematic, using 1.5a slow blow fuses
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Old 14th January 2013, 01:05 AM   #65
AJT is offline AJT  Philippines
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i guess 460v is too much for a chinese 6l6gc, you can try the chinese El34 with that voltage...
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