Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dwp on July 14, 2010, 06:12:24 pm
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Hey I just realized I have to specify make before break, or break before make on my rotary tone control scheme at my EF86 channel. So I'm stitching the contacts together with 5M resistors, 6 different degree of caps.
Question: Do I want to stay away from make before break?
I cannot tell by looking, and I would rather not un-solder my previous build to see what I put in there. I don't hear an in-between tone when switching, wouldn't that be the case if I had make before break installed?
Orrr, if I did go make before break, could I eliminate the 5M resistors?
Thanks in advance, dwp
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It isn't very critical unless you are going to switch on-air glitchlessly.
It DOES depend on the exact configuration. Many networks go "open", no-signal, if you linger between clicks. Other networks get upset if two legs are connected at once.
Use make before break and use the bleed resistors.
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Thanks for that question and answer as well. I'm doing the same thing and bought the make before break and was just hoping it was right. Thanks again.
Regards,
RD
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Hey I just realized I have to specify make before break, or break before make on my rotary tone control scheme at my EF86 channel. So I'm stitching the contacts together with 5M resistors, 6 different degree of caps.
Question: Do I want to stay away from make before break?
I added that same style EF86 with switched coupling caps to my Lightning build. I used a make before break switch for the sole purpose of eliminating those 5meg 'anti-pop' resistors. Makes wiring much easier and neater.
I cannot tell by looking, and I would rather not un-solder my previous build to see what I put in there. I don't hear an in-between tone when switching, wouldn't that be the case if I had make before break installed?
I don't notice any in-between tone changes when switching, but my ears are pretty numb to subtile changes. The easiest way to tell if you have a make before break switch when you can't see the wiper and actual contacts is with your ohm meter. Connect the leads to any two adjacent contacts and slowly operate the switch. If you get continuity while switching, then you have a make before break.
Orrr, if I did go make before break, could I eliminate the 5M resistors?
Absolutely. Make before break is perfect for this circuit. I just don't see any reason to use a break before make switch in this application, especially since the switches cost the same.