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Messages - neddyboy

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Amplifier Discussion / Re: Slowing Tremolo Speed in Univox U65RN
« on: November 27, 2015, 03:16:42 PM »
Not trying to diss SS, especially on this forum! It's just a different kind of noise on this (my first attempt at repairing SS). Plenty of noise on most of my glass bottle amps too, but it seems a little less high-frequency. I am dissing this amp though -- it does seem like it was built with frugality in mind! FYI I'm a bass player, and most of my favorite amps have been solid state.

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Amplifier Discussion / Re: Slowing Tremolo Speed in Univox U65RN
« on: November 27, 2015, 01:15:13 PM »
One last question for you gentlemen. I've replaced nearly all the electrolytic caps and a few resistors that had drifted, and the noise level has dropped substantially, but it still hisses. As I mentioned before, I'm mostly a tube guy, and this kind of noise is new for me. My battles are usually with hum!

Does hiss just come with the territory in an old, cheap SS amp? It doesn't sound like a fizzing resistor, so I'm guessing it's coming from the all-germanium transistors. Anything I can do to limit the hiss without replacing transistors?

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Amplifier Discussion / Re: Slowing Tremolo Speed in Univox U65RN
« on: November 26, 2015, 04:27:51 PM »
Wow, great explanation Roly! I've already been playing around with caps in parallel on the back of the board, and I'm up from .01 to .1 but it's still waaay to fast. I don't keep many high value film caps around, so I'll be hitting the electronics store on Friday. I'm thinking 1mf will get the speed where I want it, maybe even 2mf. I assume BP electrolytics will serve, yes? Cheaper anyway.

Enzo, yeah, same with this. With .01mf caps, the slow speed was a good bit faster than the fast speed on a Leslie, and it topped out at buzz.

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Amplifier Discussion / Re: Slowing Tremolo Speed in Univox U65RN
« on: November 25, 2015, 12:35:12 PM »
No offense taken! Any knowledge I have about repairing amps has come from fooling around trying to get my own stuff working. I'm not much on theory, and that's limiting. But I still have a blast!

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Amplifier Discussion / Re: Slowing Tremolo Speed in Univox U65RN
« on: November 24, 2015, 10:13:46 PM »
I was looking for lamp and photo resistor kind!

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Amplifier Discussion / Re: Slowing Tremolo Speed in Univox U65RN
« on: November 24, 2015, 02:47:48 PM »
Cool, thanks man!

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Amplifier Discussion / Re: Slowing Tremolo Speed in Univox U65RN
« on: November 24, 2015, 12:35:49 PM »
Thanks Galaxiex. I did that first off since that was how I'd do it in a Fender. I changed all three to .05mf, but if there was a change to the oscillation speed, it was not enough for me to hear. I suppose I could keep increasing the values, and normally I would, but since it's not my amp I'm trying to be more cautious than usual!

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Amplifier Discussion / Slowing Tremolo Speed in Univox U65RN
« on: November 24, 2015, 10:42:29 AM »
I'm working on a little Univox for a friend who wants the tremolo speed slowed down. I know it's a question of raising the value of a few caps in a Fender circuit, but what about this one? I'm not in my comfort zone with solid state and I can't find any info on this question online. Currently the tremolo is too fast to be usable even at the slowest setting, and he's looking for maybe two sweeps per second. Possible? Schem attached, and thanks in advance...

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