I'm trying to understand the determination of an appropriate sized cap for a cap-coupled SET. Working with Paul Joppa's update on Joe Roberts' WE91 300B, the schematic shows C7=0.1uF and R10=390k. Using the formula f=1/(2Pi*R*C) am I correct that this results in a corner frequency of 4.14Hz?
I also found Al's thread about replacing R10 with a choke that has the impact of changing R10 to 250k (http://www.audioasylum.com/cgi/vt.mpl?f=magnequest&m=11930). If I incorporate this change with a pair of nice NOS oil caps that measure 0.25uF, am I correct that this shifts the corner frequency to about 2.6Hz (and keeps phase shift below 26Hz)?
Am I calculating things correctly here? Does making this change result in any negative impacts that I am not considering?
Thank you for any input!
Eric
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Topic - Determining the size of inter-stage coupling cap - EricSan 18:24:42 01/22/17 (11)
- RE: Determining the size of inter-stage coupling cap - Paul Joppa 14:51:49 01/23/17 (3)
- RE: Determining the size of inter-stage coupling cap - EricSan 06:18:32 01/24/17 (2)
- RE: Determining the size of inter-stage coupling cap - Paul Joppa 14:24:14 01/24/17 (1)
- RE: Determining the size of inter-stage coupling cap - EricSan 10:05:52 01/25/17 (0)
- RE: Determining the size of inter-stage coupling cap - EricSan 11:39:00 01/23/17 (0)
- RE: Determining the size of inter-stage coupling cap - EricSan 05:01:50 01/23/17 (4)
- RE: Determining the size of inter-stage coupling cap - Tre' 07:18:50 01/23/17 (3)
- RE: Determining the size of inter-stage coupling cap - SteveBrown 08:44:35 01/23/17 (2)
- RE: Determining the size of inter-stage coupling cap - Tre' 08:59:22 01/23/17 (1)
- RE: Determining the size of inter-stage coupling cap - used-hifi 10:29:13 01/23/17 (0)
- RE: Determining the size of inter-stage coupling cap - 91derlust 18:59:29 01/22/17 (0)