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Topic: Tube amp 102 |
Tim Greene
From:
Athens Tennessee USA
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Posted 15 Jan 2009 3:07 pm |
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Last question.The ceramic disk in the center bottom of the board with all the glue blobs should be a .02. There is a .02 pushed down almost flat on the right and then two that are upright and they are both .01. All are twisted together and soldered in the .02 position.What was the logic in doing so? When I speed pick as fast as I can it still sounds slow. Would this be the cause?Thanks Tim |
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Jon Light
From:
Saugerties, NY
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Posted 15 Jan 2009 3:27 pm
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Yeah....funky caps are responsible for my slow picking.....that's the ticket!
FWIW----caps wired in parallel increase capacitance so two .01 caps in parallel would give you .02 (or so I believe...or just made up).
I must say----from this photo and the other that you posted....that is one ugly amp. No offense intended & all. I've got the same 100W amp except that it also had the pull boost until I disabled it. Even after doing some of my own unprofessional work on it (and even as a SF Fender---notorious for less than stellar lead dress), my chassis looks better than that. I've never seen glue globs like that in a Fender. There are some caps in there that I've never seen in...anything.
I've got to believe that some cleaning and component replacing would enhance this amp some.
Honestly---not trying to diss you or your amp. Just having a little fun blurting out some uncontrolled but sincere comments. |
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Tim Greene
From:
Athens Tennessee USA
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Posted 15 Jan 2009 5:40 pm
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| Thanks Jon for your honesty.I've read all of your archived querys on amps and was hoping you would join.You have any suggestions? Tg |
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Ken Fox
From:
Nashville GA USA
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Posted 15 Jan 2009 9:30 pm
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| I could clean it up for you Tim. It does look a bit untidy in there!!! |
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Brad Sarno
From:
St. Louis, MO USA
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Posted 15 Jan 2009 10:05 pm
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One think I really don't like about '70s Fenders is that when they switched from cloth to plastic coated wire, the wiring got real messy and cluttered. The '60's amps were much more tidy. That cloth wire is so much easier to bend into shape and make neat.
One thing I really like about '70s Fenders is that they tended to more consistently use the super fine 1-Watt Allen Bradley plate resistors. Actually, they tend to use AB's everywhere post '70 or '71. I think in the '60s it was a mix, but mostly Ohmites, which are pretty good. But AB's are the deal, and using a 1-watter on the plates is a good move for both noise and reliability. Ron Wickersham from Alembic said the Allen Bradley carbon comp resistors are the single most reliable electronic component ever made. Even today, that's military spec on all the still-flying B-52's. The Apollo spacecrafts depended on the AB resistors to withstand the pummeling of rocket blasts. Got us to the moon and back.
So behind all that sloppy '70s wiring are some killer resistors.
Brad |
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Jon Light
From:
Saugerties, NY
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Posted 16 Jan 2009 12:10 pm
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| Just to set things straight, Tim, I'm happy to help if/when I can but I can assure you that I have very little to offer. Not humility....just a fact. Some limited experience with minor amp mods, a lot of online reading, some stuff i picked up here or there.....the two brothers who have chimed in here are the ones I wait for when an amp question is asked. |
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Jerry Erickson
From:
Atlanta,IL 61723
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Posted 16 Jan 2009 7:14 pm
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Isn't that the trem circuit you're looking at? Where'd the roach go? Here's the same area in a 66ish Twin Reverb amp I have. It's as clean on the outside too!
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Tim Greene
From:
Athens Tennessee USA
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Posted 18 Jan 2009 8:45 am
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| Hey Jerry Bet that sounds as good as it looks!!!!Tim |
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Tim Greene
From:
Athens Tennessee USA
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Posted 18 Jan 2009 9:07 am
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| Thanks Ken and I know you can.Those 2 webbs you upgraded for me turned out great.They are so quite you think they are turned off and I have left them on overnite several times.You get used to hearing amps hiss.I bought this amp cheap and this is more of an educational process as I wanted to be able to maintain and fix it kinda myself.I feel the flames coming! Ther is a lot of information available on the internet and also here in the forum.Its not original by any means and I intend for it to be a players amp.Tim |
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Jon Light
From:
Saugerties, NY
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Posted 18 Jan 2009 9:16 am
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As long as the flames aren't coming out of your ears, go for it!
Be beyond certain that you know & understand the necessary safety procedures. I benefited from Gerald Weber's amp maintenance video. Not the best or most comprehensive source but it had one thing books didn't give me.....pictures---moving pictures---of basic procedures.
I have a number of schemos, layouts and chassis photos filed away in some folder here (if I can find it all) if you need them. |
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