"Fiddy" 50-watt build log

Reeltarded · Post by **Reeltarded** » Wed Jan 30, 2013 10:08 pm

Sounds right. My BB rebuild will forever have an idle hum because the amps were built with the PT 90° from how it is supposed to be.

vibratoking · Post by **vibratoking** » Wed Jan 30, 2013 10:37 pm

Nothing lasts forever. Forever can be fixed by 1 degree of freedom.

YouTube · Post by **xtian** » Wed Jan 30, 2013 11:59 pm

Call-me-clever department: I replaced the #8 stainless nuts holding the OT in place with #6 nuts, and this provided enough freedom to push the OT into the null, reducing the hum drastically. Definitely within spec now. Hooray!

If-its-not-one-thing-its-another department: I have major "bacon frying", random static white noise, but only when Bright or Normal channel volume controls are up, and noise vanishes if I pull V1. Already replaced tube, same sizzling. Bad solder connection or plate resistors?

Reeltarded · Post by **Reeltarded** » Thu Jan 31, 2013 12:39 am

Bright or normal.. because of the way they interact..

Just check every joint from both inputs through v1 to the mixer. It's going to be on the cathode side probably, but only takes 10 seconds to check the other 4pts hmm?

Check your board grounds and input grounds?

Bacon? Is that so bad?

YouTube · Post by **xtian** » Thu Jan 31, 2013 1:09 am

Bright and Normal both, and individually. Anyway, retouched solder joints and all is well.

Structo · Post by **Structo** » Sat Feb 02, 2013 7:38 pm

Did you get the amp into a head cab?

I would love to see the lighting.

JazzGuitarGimp · Post by **JazzGuitarGimp** » Sat Feb 02, 2013 8:52 pm

Hi Xtian, Just curious which way (towards the back of the amp?) you had to push the OT to stop the hum, or was it more of a rotation?

CHeers,
Lou

YouTube · Post by **xtian** » Sat Feb 02, 2013 11:42 pm

Lou, the trannys were like left side of image below, and I had to push the OT so they were centered with respect to each other. This cancelled the hum.

Tom, you'll have to settle for my prototype, v1, in which I installed a strip of blue LEDs, shown below.

YouTube · Post by **xtian** » Wed Apr 17, 2013 2:14 am

Fiddy V3 is finally finished. Just received faceplates from Panel Craft. Awe-some.

Reeltarded · Post by **Reeltarded** » Wed Apr 17, 2013 2:28 am

Congrats! That stands out! It's great lookin'!

jelle · Post by **jelle** » Wed Apr 17, 2013 2:45 am

Nice!!!

M Fowler · Post by **M Fowler** » Wed Apr 17, 2013 4:44 am

Those look great.

Post by **Colossal** » Wed Apr 17, 2013 11:36 am

Really nice Aaron! Is your logo plate raised/reliefed/3D?

YouTube · Post by **xtian** » Wed Apr 17, 2013 3:39 pm

Thanks, all'y'all!

Here's a detail photo of the nameplates. They're laser etched on black cap/white base Gravoply <http://www.labelengraving.com/Gravoply_ ... utdoor.htm>.

Bob S · Post by **Bob S** » Wed Apr 17, 2013 9:56 pm

Looks great Aaron.
Thanks for the plate info.
See you got 4 more plates there - what's next ?

Tube Amp Archive

"Fiddy" 50-watt build log

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Fiddy V3 finished

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