Author Topic: Strange intermittent noise from valve  (Read 1272 times)

Offline fredeb

Re: Strange intermittent noise from valve
« Reply #15 on: November 22, 2019, 02:40:08 AM »
I just checked - I have 6N8S - Russian equivalent - I'd be willing to part with one pair .

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...evolution is the gradual development and stratification of progressive series of wholes, stretching from the inorganic beginnings to the highest level of spiritual creation.
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Offline Curlycat

Re: Strange intermittent noise from valve
« Reply #16 on: November 22, 2019, 04:46:31 PM »
Thanks, Fredeb, but it's fine thank you. I have a large collection of 6SN7 valves. Just this Silvertone is my favourite and it's the one with the issue.
I have realized that the past and future are real illusions, that they exist in the present, which is what there is and all there is.  Alan Watts

Offline Kent Kassler

Re: Strange intermittent noise from valve
« Reply #17 on: November 22, 2019, 08:27:31 PM »
An ECC32 might be an interesting plug in.....dont tell the pensioners I said that! ;D
Audiophile Sound Sommelier Extraordinaire....aka Manic Depressive Temporary Void Filler Deluxe.

Offline Curlycat

Re: Strange intermittent noise from valve
« Reply #18 on: November 23, 2019, 08:38:03 AM »
Thank you KK. I have read good things about the CV181. I have the modern Shuguang Treasure CV181Z which is not quite the same as the original Mullard CV. Unfortunately, the original CV is not 100% compatible with my amp.
I have realized that the past and future are real illusions, that they exist in the present, which is what there is and all there is.  Alan Watts

Offline charles

Re: Strange intermittent noise from valve
« Reply #19 on: November 23, 2019, 12:14:35 PM »
"An ECC32 might be an interesting plug in.....don't tell the pensioners I said that!"

So true. A very rare valve that is the equivalent of the 6SN7. I have some but never used it.

Also a rare and an expensive valve. It was probably made in the 40/50's     

Those early octal Mullard ECC types were:
ECC32: similar to   6SN7
ECC33: The  rare one used in Leak 12 point one's
ECC34: low mu (11.5) triode
ECC35: similar to 6SL7
« Last Edit: November 23, 2019, 12:32:12 PM by charles »

Offline Curlycat

Re: Strange intermittent noise from valve
« Reply #20 on: November 23, 2019, 12:26:06 PM »
I was very keen on the real thing, but I read: "Typical 6SN7 heaters draw about 0.6A and the CV181z draws about 0.9A (900mA), the old Mullard CV181 drew 950mA." I understand that would be detrimental to my amp?
I have realized that the past and future are real illusions, that they exist in the present, which is what there is and all there is.  Alan Watts

Offline El Sid

Re: Strange intermittent noise from valve
« Reply #21 on: November 23, 2019, 01:35:31 PM »
I was very keen on the real thing, but I read: "Typical 6SN7 heaters draw about 0.6A and the CV181z draws about 0.9A (900mA), the old Mullard CV181 drew 950mA." I understand that would be detrimental to my amp?

Thats 50%+ more heater current - not sure the power transformer would have that much headroom, but if you can identify the transformer and find its specifications you could confirm...