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knope
The guy from the place with the thing. The one with the stuff.
Joined: Thu Jul 08, 2010 8:37 pm Posts: 1400
Yes/No: No
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Re: knope vs VC50!!
Everything I read point to that the problem is a cap(s). I think I'm just going to change all the caps in the od channel starting with the B+ BTW: does anyone know how to get the switches off? I can't really pull out the boards as the switches are mounted to the chassis and they have very short wires to the boards. I might just unsolder them though edit: these should be ok right? http://www.mouser.com/ProductDetail/Vis ... OFtC0ic%3d
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Fri Jun 03, 2011 12:33 pm |
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eddiemunster666
shredder
Joined: Fri Dec 03, 2010 10:08 pm Posts: 50
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Re: knope vs VC50!!
Here is some more information I found that might help.... http://archive.ampage.org/threads/6/gar ... C50-1.htmlI would use jumpers to a good solid ground point on all suspicious ground points to see if that helps at all. If you lived on Long Island you could bring it to my house and I would torture that VC50 until it did what I told it to do. And if that didn't work I would have my dog spot breath on it until it melted....
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Fri Jun 10, 2011 11:04 pm |
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Devtron
Best Supporting Actress
Joined: Thu Jul 08, 2010 6:13 pm Posts: 6423 Location: Trendyhipstertonville
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Re: knope vs VC50!!
If only we all lived on Long Island.
_________________ Dinosaurier live vor langer Zeit Sie waren schrecklichen Echsen weißt du nicht, Einige aßen Pflanzen und einigen Fleisch gegessen Einige aßen Fisch und einige aßen Tiere
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Sat Jun 11, 2011 11:25 am |
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torgeot
Winston Wolf
Joined: Tue Jun 15, 2010 11:10 am Posts: 7283 Location: in the valley of the shadow of death
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Re: knope vs VC50!!
'twould be one ridonkulous fucking mapsiparty
_________________ Member of the Radium Water Gentlemen's League Of Luxury
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Sat Jun 11, 2011 12:20 pm |
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Snaxocaster
Simethicone
Joined: Thu Jun 17, 2010 3:00 pm Posts: 11625 Location: McMurdo Research Station
Yes/No: Yes
Less/More: More
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Re: knope vs VC50!!
I've never banged a switch.
_________________ Member Of The Radium Water Gentleman's League Of Luxury.
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Sun Jun 12, 2011 4:51 pm |
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knope
The guy from the place with the thing. The one with the stuff.
Joined: Thu Jul 08, 2010 8:37 pm Posts: 1400
Yes/No: No
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Re: knope vs VC50!!
The schematic has the filter caps labeled as 15uf... I should be ok with 22uf right? 22uf electrolytic caps seem to be more readily available and about a dollar cheap
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Thu Jun 16, 2011 9:12 pm |
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chris_d
Winston Wolf
Joined: Wed Jun 16, 2010 7:32 pm Posts: 11362 Location: ruining everything.
Yes/No: No
Less/More: More
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Re: knope vs VC50!!
Yarp, 22uF should be fine.
_________________ STOP FIXING ROCK RECORDS.
START YOUR OWN RELIGION TODAY.
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Thu Jun 16, 2011 9:27 pm |
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Zozobra
Henry Kissinger
Joined: Tue Jul 13, 2010 7:00 am Posts: 1105
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Re: knope vs VC50!!
Yep thats totally fine. Buy 105C rated ones at 450V and they'll last an eternity. 22u is cheap enough for such extravagance. The slight increase in capacitance will tighten the low end a little. The valve wizard as always has a nifty article on filtering: http://www.freewebs.com/valvewizard1/smoothing.html
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Fri Jun 17, 2011 6:28 am |
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eddiemunster666
shredder
Joined: Fri Dec 03, 2010 10:08 pm Posts: 50
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Re: knope vs VC50!!
Is it working yet?
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Sun Jul 17, 2011 8:40 pm |
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Devtron
Best Supporting Actress
Joined: Thu Jul 08, 2010 6:13 pm Posts: 6423 Location: Trendyhipstertonville
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Re: knope vs VC50!!
Well, I don't know about it working, but he has not managed to burn down Puerto Rico yet. So that's something.
_________________ Dinosaurier live vor langer Zeit Sie waren schrecklichen Echsen weißt du nicht, Einige aßen Pflanzen und einigen Fleisch gegessen Einige aßen Fisch und einige aßen Tiere
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Sun Jul 17, 2011 8:48 pm |
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knope
The guy from the place with the thing. The one with the stuff.
Joined: Thu Jul 08, 2010 8:37 pm Posts: 1400
Yes/No: No
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Re: knope vs VC50!!
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Sun Jul 17, 2011 9:12 pm |
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Devtron
Best Supporting Actress
Joined: Thu Jul 08, 2010 6:13 pm Posts: 6423 Location: Trendyhipstertonville
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Re: knope vs VC50!!
Fuck fixing that shit. If it has already developed speech while it is broken, it is only a matter of time after you repair it that it will develop self-awareness.
_________________ Dinosaurier live vor langer Zeit Sie waren schrecklichen Echsen weißt du nicht, Einige aßen Pflanzen und einigen Fleisch gegessen Einige aßen Fisch und einige aßen Tiere
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Sun Jul 17, 2011 9:28 pm |
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knope
The guy from the place with the thing. The one with the stuff.
Joined: Thu Jul 08, 2010 8:37 pm Posts: 1400
Yes/No: No
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Re: knope vs VC50!!
ok lets do this... the cheapest(but decent) I have found are these: http://www.mojotone.com/amp-parts/TAD/T ... minal.htmlwhich I read are relabeled F&Ts which in turn I read that F&T are prtty decent caps....
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Tue Jul 19, 2011 11:59 am |
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chris_d
Winston Wolf
Joined: Wed Jun 16, 2010 7:32 pm Posts: 11362 Location: ruining everything.
Yes/No: No
Less/More: More
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Re: knope vs VC50!!
F&T are indeed pretty good caps. Back before there were more options, folks used to recommend them as a higher end choice over stuff like the Illinois and Xicon stuff. I usually went Xicon myself, as they tended to be proper inexpensive, while the F&T tended to run a bit more pricey. I have used a lot of cheap shit caps also. I bought a few totally offbrand low ESR chinese ones from Apex Jr. that were about as cheap as cheap comes: http://www.apexjr.com/capacitorA.html (just note what the voltage rating is. i got some of the 450v/47u ones that IIRC are still in my amp.) [As an aside also: Apex Jr is a pretty great place. Run by a dood who used to(maybe still does) poast on 18watt.com builder forums, he often has lots of random surplus-y inexpensive bits. Also: teflon/PFTE wire for map-building. Very quick shipper too.] Anyhoo, the only caps that i would not really ever use are the Illinois ones, because they are the only ones that i have personally seen actually fail, multiple times in multiple amps. If i am prototyping or building something for myself, i will just use whatever cheapass(non-Illinois) caps i can find. If i was building something for someone else, or to sell, i wouldn't use anything but known solid stuff: a minimum of Xicon, more likely: F&T, Mallory, Tech-Cap. Also: The VC50 uses axial caps?
_________________ STOP FIXING ROCK RECORDS.
START YOUR OWN RELIGION TODAY.
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Tue Jul 19, 2011 12:23 pm |
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Zozobra
Henry Kissinger
Joined: Tue Jul 13, 2010 7:00 am Posts: 1105
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Re: knope vs VC50!!
Guessing from the looks of all the other laneys I've seen inside of it'll probably use a mixture of both with axials used for the big boy filter caps. For now I'd bang any old crap in there to see if it brings it back to life and then worry about putting nice ones in later. The preamp at least only uses pretty small caps anyway.
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Wed Jul 20, 2011 6:47 am |
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knope
The guy from the place with the thing. The one with the stuff.
Joined: Thu Jul 08, 2010 8:37 pm Posts: 1400
Yes/No: No
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Re: knope vs VC50!!
The big boy caps are all axial in the vc50
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Wed Jul 20, 2011 1:27 pm |
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knope
The guy from the place with the thing. The one with the stuff.
Joined: Thu Jul 08, 2010 8:37 pm Posts: 1400
Yes/No: No
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Re: knope vs VC50!!
what if... R18 on the OD channel is infinity(as in open circuit)? It is located on the cathode of the last preamp tube, just before the tone stack. what would the amp do? This just might be my culprit
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Wed Jul 27, 2011 11:24 pm |
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chris_d
Winston Wolf
Joined: Wed Jun 16, 2010 7:32 pm Posts: 11362 Location: ruining everything.
Yes/No: No
Less/More: More
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Re: knope vs VC50!!
If that resistor is open circuit, then i am surprised the amp passes sound at all on the dirt channel. There is a very good chance that replacing that 100K will cure what ails you, or much of it at least.
_________________ STOP FIXING ROCK RECORDS.
START YOUR OWN RELIGION TODAY.
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Thu Jul 28, 2011 1:09 am |
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Zozobra
Henry Kissinger
Joined: Tue Jul 13, 2010 7:00 am Posts: 1105
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Re: knope vs VC50!!
Yeah if its open then surely the cathode and any signal on it is shunted to ground? If it is that then you have scored an amp for the cheapest fix ever If its much like the vh100r its a sweet ass amp!
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Thu Jul 28, 2011 6:40 am |
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knope
The guy from the place with the thing. The one with the stuff.
Joined: Thu Jul 08, 2010 8:37 pm Posts: 1400
Yes/No: No
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Re: knope vs VC50!!
1/2 watt should do right? or should I go with 1 watt just in case?
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Sat Aug 06, 2011 2:12 pm |
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