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Bypassing renkus heinz p1500 potentiometer. I need to bypass the potentiometer on my amp. I cant get parts and the pots are bad. I just want to bypass them and run the amp full out. can you advise?

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  • Master
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As the pots are part of the necessary feedback loop for the final stage, I would recommend that you jumper the wiper of each respective pot to its "full on" position. Problem solved!...accordianman

Posted on Feb 24, 2009


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Radio volume control

you got bad pot. we techs all know pot, (dope is for dopes)
there is no p/n (sure there was, back when) Pot might be NEC? or other brand, and they don't market parts here. like that. no now.

the radio is from Japan (my guess)
and the part is from a supplier, long gone, i bet. (not co. but line of parts, pots are like buggy whips , today.)

newer cars dont have pots. (they have the digital equivalent)

the real problem is finding the correct physical size and ohms.
can be vary hard, has always been. and 10x that if GANGED.
in most cases even the radio maker don't sell parts.
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try cleaning and lubing,it, mcm sells pot cleaner.

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How to replace a potentiometer

Disconnect from the mains.
Unscrew the four screws in the top
Slide out the chassis
Remove the knobs
Unscrew the pot nuts
Unclip/unscrew the PCB
Unsolder the pot
Solder in new one.
Re-assemble in reverse order
Strongly suggest you youse a better quality pot
Also the treble pot tends to go on these, replace at same time
All the best, Chris

Apr 14, 2013 | Marshall MG15DFX 15 Watt Compact 2...

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Not sure about the actual voltage, but the primary power board shows 94 V @ 2A. As this appears to be a variable speed drive, the voltage amplitude should vary depending on the speed potentiometer setting. The most likely culprit is the speed potentiometer. Poor design causes vibrations on the printed circuit board. This induces metal fatigue in the potentiometer terminations at the board. Eventually one or more terminals snap off. You could try removing the pot and connecting the wiper termination connection directly to the relative end for full speed? This is assuming you want it to run at full speed? Failing that you could try variable resistance settings and then replace the pot with a fixed resistance for the required final speed?

Sep 14, 2012 | Dremel Multi Max Kit

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When I use the Master volume the amp will suddenly bypass the master volume. And when I play on the top boost the volume fluctuates by itself. Thanks for your help Devon

I suspect you may have either a circuit board crack or the volume pot is bad or soldering of it is bad. Vibration will make things come and go. Look for broken solder around the pot leads first. Then look for a cracked circuit trace on the board near the ground end of the volume pot. If you put cleaner in the pots NEVER use Deoxit or Blue Shower. Use CRC226 which is available at Home Depot in the electrical dept.

Apr 29, 2011 | VOX AC30HWHD Amp Head

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Marshall MG50DFX is cutting in and out

Often the bypass contacts on the FX insert jack fail to close. These jacks are really poor and after plugging in a plug several times the bypass switch contact becomes sprung so as to not make good contact causing symptoms like yours.

Open the unit and inspect the jack. You can bend the contacts to tighten them BUT they will fail again.

Externally sometimes you can make a short jumper cable to connect the preamp out to the PA in to bypass the failing contacts.

On an insert jack, you can just wire a TRS plug tip to ring and plug it in.

Jun 19, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

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Crate TX50 DB has noisy DSP circuit when rotating the DSP pot!

When you are changing the DSP effect on the fly, static or noise is NORMAL !!! The DSP is changing the data and having to recalculate on the fly and doesn't mute itself while doing so which results in "garbage sounds out".

The bypass setting should NOT get any tone UNLESS you have feedback going on. If your guitar can "hear" the speakers in the amp, the strings can vibrate and get feedback going.

Unplug the guitar and see if high freq tone is still there on bypass. If the tone is in the musical range, then there is a problem if nothing is plugged in. If it is a VERY weak, very high frequency tone, this may be the digitizing noise from the DSP. On bypass, the audio is likely to still go through the DSP, just not be modified by it.

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I have a old NAD 1300 pre amp. I need to replace the volume rheostat where can i buy the part?

Hi, for the price of servisol you may as well buy a brand new pot. The nad uses a dual carbon pot. Any electronics shop should have one.
Is it a pcb mounted type or one with loot solder tags?
A couple of quid, but if you want to upgrade, then spend around a tenner and get an alps conductive plastic pot.
Try this:-

Have a look on ebay, there should be loads.

Just found this mod.

If you need more help, give us a shout and i'll try harder :)

Regards - Anthony

Feb 11, 2010 | NAD C320 2-Channel Amplifier

1 Answer

Broken Potentiometer

If all else fails and you cannot find the correct pot for it then you might try using two resistors for each "layer" of the pot (there are probably two sections)that add up to 2K ohm and solder them in as a permenant setting to replace the pot. Maybe choose a value like 1.5K for one resister and .5K for the other. This would set your volumn to about three quarters of full. It's not necesarily a good solution, but it will get your amp going again. P.S. It may be a 2.5 K pot with two sections. Good luck.

Apr 11, 2007 | Visonik VB212PKG Car Audio Amplifier

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