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Old 30th April 2013, 12:43 AM   #1
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Question My bass amp is too loud!

I'm working on fixing up a small bass combo amp (a Peavey Minx), and have run into an odd problem - it seems way too loud. Even when the volume is turned completely down, my cheap Squire P-Bass can still be clearly heard. At 1/4 up, it is almost unbearable.
The other problem it has is an annoying hiss that, again, is audible with the volume all the way down - even with nothing plugged in.
At this point, I'm not sure where to start looking - any help would be very appreciated!
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Old 30th April 2013, 03:56 AM   #2
DUG is online now DUG  Canada
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Do you have a schematic for it?
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Old 30th April 2013, 03:59 AM   #3
Enzo is offline Enzo  United States
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Which Minx do you have? What exactly does it say on the serial number plate? There was the Minx, the Minx2, the Minx 110, the Minx 110 '91, the Minx 110 '95. Does it say "transtube" anywhere on the amp? Is there two input jacks or just one? Is there a separate preamp out jack between the controls? Or is there a preamp out/power amp in jack near the end? Inside are the output transistors TO3 types or little TO126 or maybe TO220?

When you say all the way down you can still clearly hear it, tell me this: is it overly loud even on zero? I mean is the lower limit too loud? Or is it at a low volume, but you notice it is there? A lot of amps will not go all the way to silent, just from crosstalk. But it isnl;t an issue, since no one plats all the way down. On the other hand if all the way down sounds like other amps on 3, that isn't right.

Are your op amps in sockets? Makes it easy to sub on in going down the row. Noisy op amps are probably the most common source of excess hiss in a solid state amp.

There is only one gain pot, and it is in the first stage. Verify it has integrity - not open at either end.

Plug a dummy TRS plug into the phones jack to silence the speaker. Now run a line from the preamp out to some other amp. Is that signal all hissy too? This determines if the noise is preamp or power amp related.
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Old 30th April 2013, 04:03 AM   #4
GoatGuy is offline GoatGuy  United States
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The peavy minx ... ah, how many hours have I wasted with that little ... minx?

Three things come to mind: ONE - that some internal trim has been set so that the darn thing has way-too-high gain. TWO - that your Squier ... you got the knobs turned down on the bass too? Remember - gain is a 2 way street - there's the input pot on the Minx, and there's the output pot on the bass. trim 'em both. THIRD - is this a direct-connect from bass to amp? Or are there any consarned "boxes" inbetween?

There you are ... stuff to think about.

GoatGuy
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Old 30th April 2013, 04:22 AM   #5
Enzo is offline Enzo  United States
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There are no internal adjustments, this amp is utterly basic inside.
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Old 30th April 2013, 06:27 AM   #6
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by bubish View Post
At 1/4 up, it is almost unbearable.
set your bass guitar onboard control at 1/8, and amp gain control at 1/8...how is that ?
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Old 30th April 2013, 04:02 PM   #7
JMFahey is online now JMFahey  Argentina
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A 35W 10" speaker tiny Bass Amp "unbearably loud"?
Incredible.

Some day play along with a drummer and tell me if you still think it "loud".
You may add a guitar player to the mix, of course, in which case you'll post a new thread here called "I can't hear my Bass Amp".
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Old 30th April 2013, 08:46 PM   #8
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Thanks for all the replies!
I email Peavey for the schematic - I imagine I'll have it in the next day or so.
It is the first version of the Minx, before it was called the Minx 110 or anything; no TransTube label on it.
I'm not gonna have time to mess with it until tomorrow evening, but you guys have given me a lot of starting points - thanks!

As far as playing with a drummer, I have many times! But this is a smaller room, and damnit, I'm older than I used to be
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Old 30th April 2013, 09:39 PM   #9
tinitus is offline tinitus  Europe
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try play more gently and not pull the strings so hard
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Old 1st May 2013, 02:38 AM   #10
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on your guitar bypass volume pot and and tone pot if it has one lol solder straight to the output jack see if gets even louder haha
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