O rings on tubes?

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slip
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O rings on tubes?

Post by slip »

I recently saw a picture of an amp that had what looked like O rings on one of the tubes, and another tube looked like it had heat shrink or something similar on it. I am assuming this is to prevent/lessen microphonics. Has anyone tried or seen this before?
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BooBird
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Post by BooBird »

Seen the Pure Audiophile do it but most of the Drunken Loud band's i played in would'nt notice if the drum's were microphonic, :lol: :lol:
Booooooooo
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Wicksy
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Post by Wicksy »

I've always thought it to be guff but i know of a few people who swer by them for ef86s in combo amps.
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kleuck
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Post by kleuck »

I use some, at least they are good to avoid spring noises.

Image



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zaphod_phil
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Post by zaphod_phil »

I've used them successfully with microphonic 12BZ7s. In one case a 12BZ7 was oscillating due to vibration it was picking up from the speaker, which then got amplified and sent to the speaker, etc... A couple of those silicone rings fixed it good. :D
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Bacchus
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Post by Bacchus »

Believe me Slip, if you're going to use EF86's in a combo amp, you need these!!

Cheers
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morcey2
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Post by morcey2 »

I picked up a bag of 100 silicon o-rings from Grainger for $5. The ones I got fit 12AX7 and the like. I threw a couple on a microphonic 6U8 and it helped quite a bit. The ones I ordered aren't as thick as the ones in the pictures, but at $0.05 each, I'll order another bag full of thicker ones.

I tried them on a really microphonic 6GH8 and they helped, but not enough. I'll try the thicker ones when I get them.

Matt
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kleuck
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Post by kleuck »

I have others which are less thick, but i don't use them.

http://cgi.ebay.fr/TUBE-AMP-PREAMP-DAMP ... 286.c0.m14
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PeterS
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Post by PeterS »

a bag of 100 silicon o-rings from Grainger for $5
Oh, you can't use those, you have to get the audiophile ones that cost $5 each! :lol:


I was doubtful about O-rings having any effect but I tried them on some JJ 7591's that rang like crazy on certain notes, and they really work.


Mesa used to sell (maybe still does) some 12ax7s that came wrapped in heat shrink...
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morcey2
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Post by morcey2 »

PeterS wrote:
a bag of 100 silicon o-rings from Grainger for $5
Oh, you can't use those, you have to get the audiophile ones that cost $5 each! :lol:
How do you think I can afford to keep building amps? :)
PeterS wrote:

I was doubtful about O-rings having any effect but I tried them on some JJ 7591's that rang like crazy on certain notes, and they really work.


Mesa used to sell (maybe still does) some 12ax7s that came wrapped in heat shrink...
Off the subject (and OT for 18watt, sort-of), I built a Plexi7591 (Plexi6V6 w/ 7591's) and it's an awesome sounding amp. I'm seriously thinking about doing a 30-watt with a pair of them. I think they would fit nicely sound-wise between EL84's and 6V6's and give a little more power. Yes, I'm serious about the 30-watt, not just trying to keep things relevant.

Matt
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RE: O rings on one of the tubes

Post by BooBird »

Bandaids ! 8O 8O 8O 8O 8O
Boo
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morcey2
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Re: RE: O rings on one of the tubes

Post by morcey2 »

BooBird wrote:Bandaids ! 8O 8O 8O 8O 8O
Boo
Nah. Just another tool.
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Re : Morccey2

Post by BooBird »

Nah. Just another tool. ?????????
No Tuna Tonight for Charlie when he can have the real PooNanny ! :twisted:
= Amperex EF86
No microphonics, just rich, dark, Buttery Tone =
No Bandaids, :lol: :lol: :lol:
Boo
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morcey2
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Re: Re : Morccey2

Post by morcey2 »

BooBird wrote:Nah. Just another tool. ?????????
No Tuna Tonight for Charlie when he can have the real PooNanny ! :twisted:
= Amperex EF86
No microphonics, just rich, dark, Buttery Tone =
No Bandaids, :lol: :lol: :lol:
Boo
Considering that I can get 6 6U8A's or 6GH8A's for the price of a single used amperex EF86, I'll stick with the 'bandaid' for now.
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slip
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Post by slip »

Thanks for the replies. What size o-rings do you guys use for preamp tubes?
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clobo
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Post by clobo »

Hi,

My last tube order included a pair of Duende Criatura (19,5 - 22 mm). They fit both my 12(xx)7 and EF86 preamp tubes.

I did not use them yet, since my RFT EF86 (same order) is pretty quiet on microphonic.

Claude
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slip
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Post by slip »

clobo, where did you order them from?
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Post by clobo »

slip wrote:clobo, where did you order them from?
Here's the link.

Claude

http://thetubestore.com/dc-19-22mm.html
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