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Old 10th December 2003, 12:49 AM   #1
diyAudio Member
 
Join Date: Sep 2003
Location: Bay Area, CA
Default Double checking my PSU and filter question.

I'm just starting to plan my first amp project and decided to try the JE Labs 2A3. I can't decide whether to do the SRPP or 2001 model yet but they look pretty similar. I do not want to use the GZ37 rectifier and want to sub it with a 5AR4.

I did do a simulation with PSUD2 starting with a Hammond 272JX at 300V with the 5AR4 as a rectifier, 4.7uF/10H(75ohm)/100uF pi filter followed by a 120mA current load. Seems to be fine because I get 329V at the load with about 363Vp. Current rings a little at about 4mS, after turn on.

My questions are:
1) does this PS look okay?
2) is the 5AR4 a slow starter for delaying the B+ turn on?
3) is the 5AR4 too small for this current load?
4) is this enough filtering for the main B+ line?
5) should I worry about the current ringing at 4mS?

6) which design should I go for? 2a3 2001 or SRPP 2a3?
7) any recommendations for a SE OPT that cost between the Hammond 125ESE and the 1627SE?

TIA...
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