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In Reply to: RE: Silvertone Console--Opinions please posted by contrapuntal on May 12, 2016 at 10:04:48
I was wrong about the connectors. They seem to be "proprietary".
You have something to work with. The 6CA4/EZ81 rectifier heads the list, in its general category. How far to go is your call. The reverb portion is pretty hokey. However, eliminating that and the very dubious tone controls is easy enough. L_RD knows, plenty of simple, well functioning, SE 6BQ5 circuits are available. If tone controls are a "must", good stuff is available that will put the reverb bottle to good use.
While the tuner section is strictly mono, an important feature is present. Notice the multiplex (MPX) O/P jack. You can construct a MPX decoder and enjoy stereo FM. DIYer extraordinaire S. Bench provides the uploaded schematic.
Speaking of the tuner, a ticking/toxic time bomb, in the form of a selenium rectifier, is present. That part MUST go. Replace the 1/2 wave selenium rectifier with a full wave 4X silicon diode bridge. Forward drop in selenium is greater than that in silicon. Even if they were "good", which they are definitely not, the 150 WVDC tuner filter electrolytic caps. need to be replaced by parts rated for at least 200 WVDC. As modern 'lytics are much more volumetrically efficient than the circa 1960 stuff, fit will not be a problem.
Eli D.
Follow Ups:
Eli --thank you so much.
No need for the reverb. I never use tone controls, even when I have them. I had noticed that MPX decoder note in the tech manual, so thanks for the details on that.
I do listen to FM because nearby is FM90 college and commercial free. (Also, it is important that I keep the tuning eye going as I remember it from childhood--mesmerizing.)
All of you have given me great leads and ideas.
It speaks highly of the members here.
Cheers
Edits: 05/12/16
"No need for the reverb. I never use tone controls, even when I have them."
Good man! Simplify, simplify, simplify. ;> )
Again I ask, how far do you want to go? For instance, console amps frequently have undersized O/P transformers, which leads to poor bass extension. Within the 5 WPC capability of SE 6BQ5s, better performance can be realized by installing Edcor GXSE15-8-5K O/P "iron". Global negative feedback (GNFB) will ensure "full" bandwidth is obtained. A 15 W. part is chosen to ensure that core saturation (very, very, bad) from a deep bass error correction signal does not occur. BTW, the Edcor "iron" would allow for experimentation with both full pentode and ultra-linear (UL) mode O/P tubes.
Eli D.
How far to go? Good question--not thinking that far ahead yet--- but speaking of bass extension, your suggestions are right on. #1, I am a bass guitar player (for therapy, not pro)and #2, I fall asleep most nights to either E Power Briggs or Gould, Bach preludes for organ. So bass is near and dear and --the Edcor seems a reasonable upgrade.
(Before I get a start on this I have a couple components in my SS system to get repaired)
Have another tube component. Will email you on it.
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