So i really like the sound of my freshly fixed early V4 (aluminum knob version) and especially the sound it's reverb tank. I use it mainly for recording purposes. Now i'm thinking I could use it as a reverb unit. So i'm thinking about installing a dry signal mute switch so i can put any source through it and recording only the wet reverb signal. What do you think could be the best way to implement such a mod without affecting the cosmetics and the sound quality of the amp ?
04-20-2016, 02:49 PM (This post was last modified: 04-20-2016, 02:49 PM by Liquids.)
(04-20-2016, 08:40 AM)goltigut Wrote: So i really like the sound of my freshly fixed early V4 (aluminum knob version) and especially the sound it's reverb tank. I use it mainly for recording purposes. Now i'm thinking I could use it as a reverb unit. So i'm thinking about installing a dry signal mute switch so i can put any source through it and recording only the wet reverb signal. What do you think could be the best way to implement such a mod without affecting the cosmetics and the sound quality of the amp ?
Sounds Reasonable. Know that the reverb is not EQ'd by the midrange circuit though, FYI, so that control will be inactive with a simple, basic mod.
Looks like you can just break the junction of signal between R16 and C8. You can use the presumably no-longer functional polarity switch or switch location, float R16 on the junction end and use high quality shielded wire to fly a lead to a switch that will either return the signal right back to the now empty PCB pad for R16 (with more shielded cable), or said switch will instead open the circuit and hence stop all that signal--which is the dry signal.
I only looked at it for a moment, and as usual I'd let Steve/Hangman chime in as he may know a better way...been a while since I had my V4 unbuttoned, so there may be an even easier way.
Have fun! The V4 records beautifully in my experience, even at medium and low volumes, "despite" it's high power rating.
Do you want a switch or a pot? using a pot might be nice because it would give you the ability to control the wet/dry balance. which might actually be quite desirable for what you're doing.
alternately we could just do a strait up on/off switch. it really depends on what you want.
If you're not using both ext amp jacks, we could use one of them for the switch or pot. it would place the control on the back panel, but you wouldn't be doing any destructive modifications, which I always think is positive.
04-20-2016, 09:21 PM (This post was last modified: 04-20-2016, 09:32 PM by goltigut.)
I want a killdry switch. The polarity switch would be perfect for the job indeed. Still have to figure out the best wiring option. I wouldn't mind taking out one of the ext amp jacks and put a switch there. I guess it could help reducing potential noise that i could induce by running the signal near the power supply section to the standby switch position...
And isn't there a point in the circuit i could just short to ground to avoid detouring the signal path ?
with the toggle switch, thats what you'll be doing. I did a quick sketch up of what i thought would be good. you might have to make some adjustments, but this would probably be where I started.
if you use the shielded wire, you can attach one ground to the circuit board on one side, and attach it to the ground position on the switch on the other. do that with just one of the wires, For the other wire, only attach the ground on one end (pcb end is probably best).
