Question about Amplifiers & Preamps

1 Answer

Volume control needed


Am I likely to find a 30K ohm twin volume pot (two knobs on a co-axial shaft) for what must be a vintage amp? It's a Denon PMA-450.

Many thanks

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Expert
  • 107 Answers
Re: Volume control needed

Have yoou tried to find in ebay.? they should have one there.

Posted on Jan 24, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Distortion appears while trurnning up the volume on right channell

You just need to replace your volume knob for a better one , a couple of bucks 10 dollar

Jun 18, 2014 | Denon PMA-100M Amplifier

1 Answer

Hi I have a Denon DAP-2500 with POA 4400 amps, When starting up cold both sides have equal volume, then the left side drops to about 25 to 50% volume. Fiddling with cds, postions and balance sometimes...

HI , just found your post . I also have just picked up a denon DAP-2500 pre and 2 POA 4400 amps with klipsch belles, having same probs with power balance i followed some helpfull advise and deoxidized all rca jacks speaker terminals ect. also i opened the pre amp and cleand it even though it was fairly clean, i used cleaner on all switches and volume controll's . WOW I could hear it nice and clean . Next i will clean the amps. hope this works for you as this is great equpment well worth saving.

May 15, 2010 | Denon Amplifiers & Preamps

1 Answer

Deneon PMA-250 amplifier -Volume knob not working correctly

Well, it seems you have your finger on the source of the problem. If accessible, try some tuner cleaner inside the potentiometer.

Mar 05, 2010 | Amplifiers & Preamps

1 Answer

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

The volume knob has broken off at the base on chan 1 of my peavey KB100 keyboard amplifier. part needs replacing in NW London?

Was it the know or the pot? The pot is the metal(sometimes plastic) shaft with a nut securing it to the enclosure.

Here is your nearest registered Peavey service center.

This could also be repaired by someone with electronics knowledge. Just would need to know the pot taper and resistance. This would be on the front of the pot on the same side as the shaft. The enclosure would need to be taken apart.

Jun 21, 2009 | Peavey VTB1 1-Channel Amplifier

2 Answers

NAD spare parts

Hi....sounds like dirt or pitting on the carbon tracks in the pot.

The cheap solution is to USE it....often the carbon /graphite tracks will re-whet when rubbed by the wiper in the pot and hey it's ok until next year ....BUT............I mean do this....

Turn off the power and rotate the volume knob appx 100-200 times back and forth...........power up and check.
Use low continuous frequencies (synth music?) if possible as the lower the frequency is, the nearer it is to dc. and really exposes these faults easily.

Or spray WD40 (fix all graphite spray) into the pot while rotating.

OR get a genuine I guess

OR get an equivalent from your LHS is a good amp..........had one myself.......IT shook the Hi-Fi world by its' simplicity price and zero BS""t..........I knew the designer thru Dolby London where i was working man.


Nov 22, 2008 | Amplifiers & Preamps

1 Answer

HI-Fi Amp Issues

I'd love to have more information to go on, but I can give you a few things to check:
If there is a traditional volume control that is motorized, you will see the volume knob start moving on its own after you start it up. If that is the case, you'll need to have someone look at the motor control circuit. Luckily these are almost so generic that parts would be as common as replacing fuses.
If there is a volume knob that is an encoder, it may be faulty. How to tell if it is an encoder? Easy. If it will spin continuously with no extra effort, in both directions, it is an encoder. If in fact there is an encoder present underneath the knob, and the amp is responding to the remote correctly, it may be as simple as someone replacing the encoder.
If there is no volume knob at all, just a couple buttons to press, one for up, one for down, there are issues in that circuit that will need to be addressed.
If the volume control is only from the remote, and it keeps climbing on its own until you turn it down, there is a digital volume control chip that controls the volume. Unfortunately, anything in the circuit from that chip itself, all the way back to the sensor for the remote, could be faulty.
HOWEVER, do not despair yet, there may be another area to check. Turn the amp on, then IMMEDIATELY take the batteries out of the remote. If the volume stops climbing right there and then, guess what? :) Time for a new remote, or have someone take a look at the one you have if it is an expensive unit. One more related thing to check: If there are any other remotes in the room, remove them, or any other possible sources of infrared light. Alternately, take a piece of heavy black electrical tape and cover the sensor for the remote, and turn the amp on. If it behaves normally, something else in the room is "telling" the amp to increase volume. If any of these tests produce results no different from what you've experienced so far, the fault is in fact inside the amp.

Sep 25, 2008 | Amplifiers & Preamps

2 Answers

Nad c372 Remote Control

Hello Robert,

If the standby/protection indicator on the amplifier blinks when you specifically press the volume +/- key, it obviously indicates that the unit is receiving the remote's command.
Try the following while pressing the volume key on the remote:
1.- Put your ear as close as possible to the volume control knob and listen for the sound
of a motor spinning, if you hear it, the volume control assembly needs repair. If you
hear no sound, proceed to next step.
2.- Gently rotate the volume control knob on the amplifier unit (it might be stuck and
needs a "little help").

If none of the above applies, the unit needs to be opened and troubleshooted. I've seen many instances where the volume control motor was not properly connected to the board or the assembly was put back incorrectly (specially in units that have been opened to be refurbished). I've heard NAD has a limited warranty for refurbished items. It might be wise for you to check before sending the unit for repair at your expense or trying to tackle the problem yourself. Hope this helps.



Dec 26, 2007 | NAD C372 Amplifier

Not finding what you are looking for?
Amplifiers & Preamps Logo

Related Topics:

100 people viewed this question

Ask a Question

Usually answered in minutes!

Top Amplifiers & Preamps Experts


Level 3 Expert

4502 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

The Knight
The Knight

Level 3 Expert

66352 Answers

Are you an Amplifier and Preamp Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides