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Topic: Sho Bud Single Channel Fuses |
Rich Gilbert
From:
Freeport, Maine
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Posted 30 Aug 2010 12:13 am |
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| Hey there, does anyone know what the values should be for the 3 fuses on the Sho Bud Single Channel Amp? If you look at the back panel of the amp there is a single fuse holder standing alone on the left of the panel, then further to the right there are 2 fuses very close to each other. I have a 1 & 1/2 amp fuse in the standing alone fuse holder, then a 3 amp fuse in the first of the two fuse holders that are next to each other. I'm missing the fuse for the 2nd of the 2 next to each other fuses. I want to be certain I put in the proper value fuse. And I also want to be certain that the fuses that are already there are the proper values. If anybody knows the answer to this please pass it on. Thanks! |
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John Billings
From:
Ohio, USA
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Posted 30 Aug 2010 6:43 am
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| Have you tried a net search with the name and model number? There are several sites that have mucho schematics, and they would give the fuse values. Schematic Heaven is one site, but there are others. |
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Rich Gilbert
From:
Freeport, Maine
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Posted 30 Aug 2010 8:12 am
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| Hi John, I did find a schematic online. It only has the fuse value listed for the single stand alone fuse (2 amp), the other two fuses are not specified. Would that mean they are also 2 amp fuses or is this a bad assumption to make? |
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John Billings
From:
Ohio, USA
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Posted 30 Aug 2010 8:15 am
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| No, I think that would be a bad assumption to make! Ya don't want to mess up your amp! Keep looking. Someone here will know fur shure! |
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Mike Kowalik
From:
San Antonio,Texas
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Posted 30 Aug 2010 11:08 am fuses....
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In the last 3 months or so a couple Sho-Bud single channel amps have sold on The Forum....do a search and email the new owners about the fuse(s) in question......hopefully they will pull the fuse out of their amp and get the info you need.
_________________
Cremation is my last shot at having a hot body...... |
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John Floyd
From:
R.I.P.
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Posted 30 Aug 2010 11:30 am
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I used to work at Sho-Bud building amps for a while in 1974, I have the Dual Channel and Single Channel amp schematics here on my computer. The Single Channel and Dual Channel amps are exactly the same except for the added channel. The Single Channel Values for the fuses aren't listed, but the Dual Channel Shows 3 amp fuses for the + and - Power supply feeds to the output section and a 2 amp Fuse for the 117 VAC line Voltage. An Educated Guess Since the Single Channel Amp is essentially the same as the Dual Channel would be what I have suggested,3 amp Fuses on The DC and a 2 amp on the AC.
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Rich Gilbert
From:
Freeport, Maine
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Posted 30 Aug 2010 12:28 pm
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| Thanks for the info John. I found a copy of the exact same schematic you have for the Single Channel Amp online and as you mentioned, there is no indication of what size fuse is needed for the DC supply. Since there already is a 3 amp fuse is one of the DC fuse holders, I was estimating that the other DC would also require a 3 amp fuse. Thanks a lot for your input and your knowledge. I love this amp and want to get it back up and running again. The fuse holder fell out on the way to a gig last week and while I was able to find the fuse holder, the fuse has gone missing. I certainly don't want to put the wrong value fuse in and end up creating more problems. This is a great sounding amp that really enhances the tone of my 73/74 Sho Bud Pro I. |
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John Floyd
From:
R.I.P.
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Posted 30 Aug 2010 12:38 pm
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| If we had computers in 1974, There would be professional Quality Schematics, back then we had to draw them by hand. |
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Rich Gilbert
From:
Freeport, Maine
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Posted 30 Aug 2010 8:06 pm
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| One more question for you John, do you know if there's any way to date my Sho Bud Single Channel amp by the serial number? I reckon I could get an estimate of when it was made by checking out the pot codes, but is there an easier way that you know of? And do you have any idea of what years the Single Channel amps were made? I've noticed in some photos that some of the Single Channel amps only had one fuse for the DC, I'm assuming the second fuse was added later. Anyway, any info you could give from your first hand experience about the history of these amps would be greatly appreciated. I love mine and would love to know more about the manufacturing history of these amps. |
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Dave Zirbel
From:
Sebastopol, CA USA
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Posted 30 Aug 2010 8:22 pm
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Sho Bud amps are pretty special in my opinion. I have a Dual Channel Xmas Tree but the vibrato doesn't work. It's great for Tele and steel. It just had some problem with a loud hum. Turned out to be loose ground wires. What makes them so special? How hard would it be to build a clone that sounds as good?
Also the info about the fuses was helpful since I blew one during a show. I'll get me some backups!
Dave
_________________
Dave Zirbel-
Sierra S-10 (Built by Ross Shafer),ZB, Fender 400 guitars, various tube and SS amps |
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John Floyd
From:
R.I.P.
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Posted 31 Aug 2010 3:21 am
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| If There are only 2 fuses, my guess is the speaker was fused and not the DC. It Wouldn't make much sense to fuse only 1/2 of the power supply. Unless David Jackson has records of when the various Serial numbers were shipped, then there is no way of telling when a particular amp was built. |
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Rich Gilbert
From:
Freeport, Maine
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Posted 31 Aug 2010 8:41 pm
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| Thanks John for your help in solving the fuse issue. Put the 3 amp fuse in, took the amp to a 4 hour gig today, amp performed beautifully, no problems whatsoever. |
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