FDP Forum / Vibroverb RI - want reverb added to channel 1/ 10 messages in thread.

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telefender



canada

fender50
Jan 4th, 2017 03:54 PM        

I know that technicians have figured out a way to add reverb to channel 1 on the VVB-RI with the pcb. I've done it to my DR-RI ....and it was simple...but I need someone who can tell me where to modify the pcb on a layout schematic... Or if there is a link to a mod such as this on the forum. Many thnks in advance .



pdf64



UK

Jan 5th, 2017 02:17 AM        

Unsolder one leg of R35.<br /> Add a link wire between the pin6 nodes of V1 and V2.<br /> Sorry, no layouts look to be in the public domain.



telefender



canada

fender50
Jan 5th, 2017 10:03 AM        

Yup...see the R36 easy. Cannot locate the V1/V2 on the layout diagram I printed off the web. Could it have different letters ?<br /> NTS -at this point ?



telefender



canada

fender50
Jan 5th, 2017 10:04 AM        

Yes , R35 is located ... not the V1/V2 .



telefender



canada

fender50
Jan 6th, 2017 02:17 PM        

Are the V1 and V2 referring to the tubes ? Valves?<br /> Can you clarify for me ?



Hammond101

Contributing Member
**********

So. Cal. USA

Jan 6th, 2017 03:01 PM        

Yes V1 and V2 are tubes. The two right most preamp tubes viewed from the rear of the amplifier.



telefender



canada

fender50
Jan 7th, 2017 11:12 AM        

Just getting this mod underway....clipping the R35 and wiring the V1 pin 6 to V2 pin 6. Is it also recommended to clip out R11 ???<br /> Anyone else do this mod to add reverb to channel 1 on VV RI ??<br /> <br /> thnks



pdf64



UK

Jan 7th, 2017 02:09 PM        

I don't see any point / benefit in eliminating R11.



telefender



canada

fender50
Jan 7th, 2017 04:43 PM        

OK... thnks again...just noted it in another forum that said to remove both R11 and R35!<br /> Mucho Gracius ....



pdf64



UK

Jan 8th, 2017 03:16 AM        

Just to expand, removing R11 will act to significantly change the operating point of the channels' 2nd stages and also increase the amp's gain after the volume control a few dB.<br />



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