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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: Ponderings on the PV10 vs. PV-12 posted by erik_squires@hotmail.com on July 21, 2006 at 05:06:44:
As Jeff pointed out, CJ has still stockpiles of PS caps. When they realize a worldwide commodity may disappear they move rather quickly. As a matter of fact I believe that's why the last production run of GE 6550's and 6CA7's disappeared so quickly in the mid to late '90's....
Sorry about the quality of the scan.
The picture in the right corner was supposed to be what you would see looking at the bottom of the PCB. It shows where to cut the traces and insert the diodes. I use a 1u4007, fast recovery type, and a a cheesy 5 to 10 uF electrolytic cap, making everything fit under the board.I've tried film caps, and they do sound a bit better, but the small electrolytics seem to work very well and have the advantage of fitting under the board.
You may want to try different coupling caps, especially if your unit runs Solens. I personally find them a bit slow and smeared. Try something like the Holland's or other premium caps.
Also if you'd like better bass, bypass the cathode with a larger cap. I use a 1.5 uF film cap for a nice increase in low frequency response and detail. There ought to be a small 'styrene cap there now, 150 pF or so.
I also make a bridge using AC caps (.1 uF) across each filament transformer output winding and from each leg to ground. I believe a lot of the spikes from the diodes are reflected back into the transformer, and this helps snub them. The result is a sound with more 'body' and presence.
Have fun,
Stu
PS. Oh yeah try putting real wire from the input jack to the selector switch. I like the kimber SF 23 oval wire.
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Follow Ups
- Re: Ponderings on the PV10 vs. PV-12 - unclestu52 00:06:17 07/24/06 (0)
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