Russell, I had a touch too much hum on my build as well. This is with very efficient horn speakers and a cheap Ebay switcher. As I said in a previous post I just added some more capacitance after the switcher much as Nelson has done of some of his projects using a switcher and lowered my hum to an acceptable level. Why not give it a try first. Something in the neighborhood of 1500uf to 2200uf caps.
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Russell, I had a touch too much hum on my build as well. This is with very efficient horn speakers and a cheap Ebay switcher. As I said in a previous post I just added some more capacitance after the switcher much as Nelson has done of some of his projects using a switcher and lowered my hum to an acceptable level. Why not give it a try first. Something in the neighborhood of 1500uf to 2200uf caps.
That doesn't look like a switcher?
That doesn't look like a switcher?
Your correct, regulated PS. Two brain farts of late.
Only one fatality in surgery, one of the 10 poof caps lost a leg. 6l6, gotta part number?
going through all my parts, none this small. found some 680 poofers, I'm pretty sure I have some 100 poof caps but cant find. I better look at amazon or ebay for small quantity. What Am I looking for, ceramic or what? 50 volt, 100 volt or ?
I could have these in 10 days:
Jameco Valuepro MD10-VP-R Monolithic Radial Ceramic Capacitor, 10 pF Capacitance, 50V, Epoxy Dipped Case (Pack of 40): Amazon.com: Gateway
Thanks,
Russellc
Whoops, that's 2 days. Ordered correct one from mouser along with some other items.
Russellc
Hi Jim, sent you a PM yesterday for a set of boards.
thanks
@6L6
Hope you received my PM for a pair of these boards last week.
thanks
I've received many PM from interested people for the PCBs. I have not yet responded to anybody.
Again, if you are interested I'm currently forming a list;
I have the last batch of the purple PCBs that Wayne had made. There are about 50 stereo sets. I will send a set to anybody interested if you pay shipping.
If interested send me a PM with -
Forum Name
Real name
email
post address.
They will fit in a standard envelope so I suspect shipping won't be all that much.
Again, if you are interested I'm currently forming a list;
I have the last batch of the purple PCBs that Wayne had made. There are about 50 stereo sets. I will send a set to anybody interested if you pay shipping.
If interested send me a PM with -
Forum Name
Real name
post address.
They will fit in a standard envelope so I suspect shipping won't be all that much.
Russell, what kind of transformer are you using?
The Antek 6L6 suggested a few posts back.
Russellc
6L6, Jim, Do you have a BOM on the parts you used in your kit for the users of just the boards? I have a friend that has contacted you on some boards asking me for a BOM and I would like to use the same parts you used in the kits you sold earlier.
Would like to see this also...
Russellc
Just some input for others... Mouser carries a board edge mount similar to those mentioned earlier. The part number is 761-30468-N. You can use them either on the corners or on the edges.
Link: 30468-N RAF Electronic Hardware | Mouser
TJ
Link: 30468-N RAF Electronic Hardware | Mouser
TJ
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The Antek 6L6 suggested a few posts back.
Russellc
Even Nelson has said there is a lot of variances in Toroid's. Have you tried placing the toroid far away, outside the case, and see if you still have the hum? There is a member on this forum who had a bad hum on a M2 build. He spent a lot of time and money before moving the transformer outside the case. It was the toroid causing the hum.
Even Nelson has said there is a lot of variances in Toroid's. Have you tried placing the toroid far away, outside the case, and see if you still have the hum? There is a member on this forum who had a bad hum on a M2 build. He spent a lot of time and money before moving the transformer outside the case. It was the toroid causing the hum.
I actually had it dead quiet. Then did the cap swap 6l6 noted. Killed a cap, should have replacements any day. Must have had a bad solder joint which surprised me....generally very careful, but there you have it! I mean there was no hum, stone dead quiet.
Russellc
Do you think audible noise can be reduced by using this kind of resistors in pre-amps?
http://www.vishaypg.com/docs/63140/var.pdf
I never see them in any pre-amp projects but they are made for the purpose?
http://www.vishaypg.com/docs/63140/var.pdf
I never see them in any pre-amp projects but they are made for the purpose?
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