Parallel effects loop for Marshall style amps

catalin gramada · Post by **catalin gramada** » Tue Feb 10, 2009 1:56 am

Hi Larry,
Thanks for schematic
I want to do a separate FX module to use with all amps I have, so I must do another power supply. I intend to use a ECC83, what line voltage you suggest for anode ? ( I already have available a 350Vcc power supply ).
Thanks

novosibir · Post by **novosibir** » Tue Feb 10, 2009 2:50 pm

catalin gramada wrote:I want to do a separate FX module to use with all amps I have, so I must do another power supply. I intend to use a ECC83, what line voltage you suggest for anode ?

320...350V

Larry

catalin gramada · Post by **catalin gramada** » Tue Feb 10, 2009 7:47 pm

Hi,
Need 4,7K resistor and 20u cap if I do a separate power supply with own filtering (220u) ?

Thanks

yobdab68 · Post by **yobdab68** » Wed Feb 18, 2009 6:37 am

Hi Larry , I try a loop in a Marshall 50 watt, It was a kind of KOC - Tut loop but I was not much satisfied.

I read a lot here 'bout your loop so if You could send me the schematics i 'll give it a try.

Thanks.

novosibir · Post by **novosibir** » Thu Feb 19, 2009 12:09 am

catalin gramada wrote:Need 4,7K resistor and 20u cap if I do a separate power supply with own filtering (220u) ?

No, if you get out of your power supply ripple free 320...350V DC

Larry

rip · Post by **rip** » Thu Feb 26, 2009 11:03 pm

Hey Larry I was wondering are both 22uF caps 450V?

Also have trouble sourcing these caps, can a 30uF be used? Any ill effects?

Or maybe a 32x32uF cap can?

Thanks
Rip

novosibir · Post by **novosibir** » Thu Feb 26, 2009 11:13 pm

One is a cathode cap, where 16V wouldt be plenty, the HV cap can be higher than 22µ no prob!

Larry

rip · Post by **rip** » Fri Feb 27, 2009 4:31 pm

novosibir wrote:One is a cathode cap, where 16V wouldt be plenty, the HV cap can be higher than 22µ no prob!

Larry

Can a higher value like 30uF be used on the cathode cap as well?

Thanks again for the help
Rip

Ennkuhl · Post by **Ennkuhl** » Sat Feb 28, 2009 7:57 pm

Hello Larry,

I'm interesting by your FX loop.
Could I have please the schematics of your FX loop ?

Thanks
Laurent

ß@®+ · Post by **ß@®+** » Mon Mar 02, 2009 10:48 am

Hi Larry. I finally finished my amp. Your FX loop is working brilliantly! Thanks!

rip · Post by **rip** » Mon Mar 02, 2009 11:35 am

novosibir wrote:
antosimoni wrote:also can I use a 20u/450V instead of the 22 one??
Shure, all values from 16

Hey Larry I found this post soo... anything 16uF and up for the filtering?

And again what are the alternatives for the cathode? 22uF and up?

Will any of this affect tone?

Thanks
Rip

zevoz · Post by **zevoz** » Mon Mar 02, 2009 4:41 pm

Hi Larry:
I'm very interested in your loop. Any chance I could still get a copy?
Thanks:
George

samwheat · Post by **samwheat** » Mon Mar 23, 2009 6:38 pm

Thanks Larry !!!!

novosibir · Post by **novosibir** » Mon Mar 23, 2009 6:53 pm

Ennkuhl wrote:Could I have please the schematics of your FX loop ?

zevoz wrote:I'm very interested in your loop. Any chance I could still get a copy?

Once again guys!

As I already wrote in the 1-st post of this topic, loop requests ONLY via PM AND included email address!

Loop requests in this topic or requests by PM, but w/o email address will be regarded like not written!

Keep in mind, that I can't put a .pdf document in a PM

Larry

erigm · Post by **erigm** » Tue Apr 07, 2009 9:29 pm

Larry,

I put your loop into my new amp (completely modded Fender Bassman 10). Thank you very much for providing that schematic!

I like it a lot so far, but I've noticed a couple of things. The loop send control "thumps" when I turn it all the way down. Does this mean I have some DC across the pot?

Also, I noticed the "dry" path's tone is quite a bit brighter than the "wet" paths tone, even with nothing in the loop. I think I may try a different value of bypass cap across the 220k, or remove it all together. Any suggestions?

Thanks!!!

Eric

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Parallel effects loop for Marshall style amps

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