Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dwp on June 16, 2010, 09:03:15 am

Title: Another How to eliminate Pop please
Post by: dwp on June 16, 2010, 09:03:15 am

OK mine is more just a snap, not real loud, but when both channel volumes are cranked, it is noticeable. I'm using one of Dougs relays to switch the input jacks from normal channel (5F6A) to EF86 Channel. I have the other pole of the relay grounded when switched out of use. The noticeable snap is when I switch from 5F6A to EF86 channel, not so much switching back. Can I put a 5M resistor across the poles, think that will fix? or a cap and what size?
Thanks in advance, dwp

Title: Re: Another How to eliminate Pop please
Post by: RicharD on June 16, 2010, 01:50:33 pm

http://www.el34world.com/Forum/index.php?topic=9461.0

See Leevi's thread on pops.  I quoted PRR when he straightened me out about protection diodes across relay coils.  A 5M resistor to shunt transients can't hurt either.