Tube dampers for Svetlana SV811

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mca

Tube dampers for Svetlana SV811
« on: 17 Mar 2018, 06:44 pm »
Trying to tame some pretty severe microphonics. Curious which tube dampers fit these tubes best?

jriggy

Re: Tube dampers for Svetlana SV811
« Reply #1 on: 17 Mar 2018, 07:47 pm »
I have two sizes here, I’ll check later today and let you know....

Jason

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Re: Tube dampers for Svetlana SV811
« Reply #2 on: 17 Mar 2018, 09:24 pm »
According Herbie site is the 55mm:
UltraSonic Rx-55
For jumbo-size tubes 2-3/16" to 2-5/16" diameter (55mm to 59mm), including 101D/101F, narrow 211 (RCA), 211/VT-4C (GE), 2A3 (EML), 2A3-Mesh (EML), 274A, 300B "Balloon" (KR), Svetlana 300B, Takatsuki TA-300B, 45 (EML), 46 globe-shape, large bottle 5Y3GB (smaller Mazda uses UltraSonic 40), 80 globe-shape, "narrow" 805 (RCA, United), 829B, 841, 842, narrow 845 (Amperex, RCA), 845A (Shuguang), 872, GE211, "Big Bottle" GZ37, KT150 (specify size "60" in comments section of order form), SV811-10, ST-17 bulb, T-18 bulb.

jriggy

Re: Tube dampers for Svetlana SV811
« Reply #3 on: 17 Mar 2018, 10:43 pm »
FRM must be right, as I have RX-65, which are to big for that tube and RX-50, which are to small.


FullRangeMan

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Re: Tube dampers for Svetlana SV811
« Reply #4 on: 17 Mar 2018, 10:55 pm »
Trying to tame some pretty severe microphonics. Curious which tube dampers fit these tubes best?
Do you would post some images from this 811?
Mainly the internal structure.

TimS

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Re: Tube dampers for Svetlana SV811
« Reply #5 on: 18 Mar 2018, 04:38 am »
I've been reading about using rollerbearings as a means of "vibration isolation" that can be used on speakers as well as amplifiers.  It may work well for tube microphonics as well.
Heres a link to a good discussion about it here:
http://forums.stevehoffman.tv/threads/attention-barry-diament-and-other-speaker-isolation-gurus.154013/

Vinnie R.

Re: Tube dampers for Svetlana SV811
« Reply #6 on: 20 Mar 2018, 03:16 pm »
Trying to tame some pretty severe microphonics. Curious which tube dampers fit these tubes best?

Hi mca,

The 811s are very sensitive to microphonics in LIO DHT PRE, and tube dampers such as the herbies will only help a little.

But the microphonics shouldn't really be an issue unless you LIO is next to the speaker, or the rack that the
LIO sits on is picking up a lot of vibrations from the speaker.  If that is the case, and isolation platform
for the LIO might help.

Vinnie