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verivorax
Platinum Member
Canada
1185 Posts |
 Posted - 12/05/2008 : 03:42:58
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Hi all,
Today I acquired a VB-2..  I was (and am) massively stoked. It's genuine seasickness  but can approach a ringmoddish sound if pushed all the way.
BUT.. on this particular VB-2, the "Rise Time" knob seems to have no effect whatsoever. The spec in the manual suggests that it should offer 150ms - 5s, but I get no variation at all. 
Has anyone encountered this? or better yet.. know what to test/do? I'm hoping it's some simple shorted lug on a pot.. please..
Thanks!! |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 12/05/2008 : 05:44:21
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Sounds to me like it might be a pot problem? (wiper is broken, or a wire off)
Or maybe D7 is open circuit?
Or maybe R58 is open circuit?
Congrats on the score! Hope it comes good quickly/easily! |
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DeFrag
Moderator
USA
3409 Posts |
Posted - 12/05/2008 : 06:17:56
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Congrats on the VB-2!
I so want one. |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 12/05/2008 : 21:35:12
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so.. the pots are affixed to a little pcb, and everything there looks clean. ..I don't have my digital camera here (21 film cameras within a metre of my head though), but where's R58? I can't see that label on the board anywhere.
Here's the pic from ssanyee's VB-2 in the "internal pics" thread:
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I know there was a repair done on it, to replace the MN3207 (which fixed it from being non-functional - the previous owner told me this). The MN3207 is in a socket now, but the repair looks clean..
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I'll try to get a pic of mine up tonight. Mine is Feb 83, and doesn't have a painted bottom edge. Ssanyee's looks like whoever held the spraygun went a little nuts!
Thanks ssanyee!! |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 12/06/2008 : 15:32:35
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| Check your PM |
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bosshog
Silver Member
Canada
493 Posts |
Posted - 12/06/2008 : 21:35:26
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| I think one of those knobs are a placebo |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 12/06/2008 : 23:41:44
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quote:
Originally posted by bosshog
I think one of those knobs are a placebo
Your VB-2 doesn't work either?? |
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bosshog
Silver Member
Canada
493 Posts |
Posted - 12/09/2008 : 03:52:32
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| I am pretty sure one knob is dormant... |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 12/09/2008 : 04:55:55
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According to the schematic, all the knobs do "something"... the adjustments the changing resistance makes to the signal path should result in an audible change.
Let me do a bit more research... I have access to a VB-2 and will check.
EDIT: OK... I've confirmed on an actual VB-2 that what it does is control how "hard the effect hits" when you turn it on. Best demonstration is to put the pedal into "unlatch" and put the rise time to minimum. Strike a chord/note and step on the pedal - the vibrato "slams" in. Now put the rise time to maximum and do it again - vibrato comes in smoothly over a second or two. I couldn't make it "5 seconds"... Sounds to me to be 0 to maybe 2 seconds
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Edited by - Laurie on 12/09/2008 14:17:49 |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 12/09/2008 : 14:30:37
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Well, hey.. if that's the case with 3 distinct VB-2s then I can handle it. It DID seem to do everything people said it did - the text in the manual is a bit ambiguous.  An almost dormant knob would go nicely with the redundant "bypass" mode. 
That's great.. I'd rather not take the whole thing apart again! I'll leave it as-is. Now that I know it's fine, I have to let my wife hide it.  Only way I'd ever get it, I suppose.
Thanks Laurie and Bosshog for your help!! |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 12/09/2008 : 14:52:53
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"redundant bypass"... I think they must have been able to only get 3-way switches... so had to figure something to do with the third position. Although, if you took the switch away completely it would be the same pedal. Oh well, I guess that's part of what makes it a VB-2, eh?
I can tell you that the vibrato sound was crap compared to the vibe on my fender tube amp. It's no wonder they didn't sell well!
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Edited by - Laurie on 12/09/2008 14:54:15 |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 12/09/2008 : 19:18:11
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I just played around a bit with it and got some nifty fast leslie sounds, and an okay siren-style sound. The RISE TIME does exactly as you describe - I think on the deepest depth you may get a 5sec. rise time if you hammer it on at the right point in the wave.. am I right?
The smoothness of the modulation is pretty unnatural sounding, but I can see it applying nicely when I do an ambient soundscape wind-tunnel thing.
Re: "Redundant Bypass" It might be easier for a keyboard player who wants to control Rate/Depth/Rise Time to turn a knob rather than depress the treadle by hand...
Right now, I'm glad it was unpopular, and gladder that I won't need to buy a second one to complete my collection (no SS or major changes). Not that I'd throw one out of bed, so to speak....   |
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VB-2... no rise time?
