The amp kit has three film caps in the values of 1.0uF, .1uF, and .01uF. All three are connected in parallel. Can I use one 1.5uF Film cap rated at 600VDC instead of the three. I have several good PolyPro film caps on hand. Anybody see any problems upping the values to 1.5uF for this ESL cap.
3 posters
ST-120 Amp ESl Capacitors
geode- Posts : 8
Join date : 2015-04-16
corndog71- Posts : 840
Join date : 2013-03-19
Location : It can get windy here
I think just a 0.1uF would be adequate. It's just a bypass cap.
geode- Posts : 8
Join date : 2015-04-16
corndog71 wrote:I think just a 0.1uF would be adequate. It's just a bypass cap.
Thanks Corndog. So, the 1.5uF wouldn't be a problem. I have these caps and am itching to install them somewhere. I'm also chasing a low level hum in the left channel only. The hum is constant and isn't influenced by the attenuator. I'm thinking some wire might need re-routing. Already moved all the tubes around.
Bob Latino- Admin
- Posts : 3276
Join date : 2008-11-26
Location : Massachusetts
geode wrote:The amp kit has three film caps in the values of 1.0uF, .1uF, and .01uF. All three are connected in parallel. Can I use one 1.5uF Film cap rated at 600VDC instead of the three. I have several good PolyPro film caps on hand. Anybody see any problems upping the values to 1.5uF for this ESL cap.
Yes - you can ...
The newer VTA ST-120's (and M-125's) now have just a single 1.0 uF @ 630 volt ESL bypass cap. The two smaller caps were found to not really be necessary. The purpose of the ESL cap is to act as a "bypass cap" for the high voltage system. This cap gives the high voltage system a low impedance path to ground and helps break up any resonances in the larger caps.
Bob
geode- Posts : 8
Join date : 2015-04-16
Bob Latino wrote:geode wrote:The amp kit has three film caps in the values of 1.0uF, .1uF, and .01uF. All three are connected in parallel. Can I use one 1.5uF Film cap rated at 600VDC instead of the three. I have several good PolyPro film caps on hand. Anybody see any problems upping the values to 1.5uF for this ESL cap.
Yes - you can ...
The newer VTA ST-120's (and M-125's) now have just a single 1.0 uF @ 630 volt ESL bypass cap. The two smaller caps were found to not really be necessary. The purpose of the ESL cap is to act as a "bypass cap" for the high voltage system. This cap gives the high voltage system a low impedance path to ground and helps break up any resonances in the larger caps.
Bob
Thanks Bob. Just checking to be sure.