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TB 17th April 2012 05:09 AM

34-step attenuators for sell
About 8 years ago my friend told me about inventory sale of the firm which produced marine equipment ( I did not pay attention to their name ). The firm was moving to new location and some of their inventory was put on sale. Looking through shelves I have noticed box with big potentiometers. One of the engineers said these are series 34-step 25 Kohms log attenuators. I did not expect them to be made for audio,but the switches were impresive. I bought them for the purpose of converting them into volume controls for my DIY preamp projects. As the engineer said they look as very good quality switches. The front of the pot and shaft are made of stainless steel. Output contacts are gold plated. I am not sure about the internal contact material. The switch is of make-before-brake type. On one of the pictures my pen points to screw which adjust rotation torque. The pot has very nice feeling when screw is removed. I have 8 of them. Two of the pots were converted by me into volume attenuators ( I have never used them. I used carbon composition resistors for this purpose ). The rest is untouched. I am being forced to sell them for economical reason. Attenuators were made by Tech. Lab. INC from Palisades Park in New Jersey. Majority of used resistors in orginal pots are Dales. The last few steps use regular wire instead of resistors. The marked type is PF.833.2.B and serial numbers are: 0778. Please note: I did not used them as volume controls yet. I am not sure about their sound quality in current setup. They do use Dale resistors, but they also use wire instead of resistors for few steps. They might sound great as such, but I bought them as base for my own step attenuators. I ask $55 per attenuator ( I paid $90 when I bought them ). Please let me know if you are interested.

TB 17th April 2012 05:14 AM

I think I need help....I have images of attenuators stored locally on my computer. How to attach them? The attache image option asks for image url.

opc 17th April 2012 05:16 AM

I might be interested in a pair of these...

Can you post a picture? Are these two gang or four gang?


opc 17th April 2012 05:18 AM

Below the main text box click on "Manage attachments" then just click on "browse" in the top box in the pop-up. Find the file, wait for it to upload and you should be good to go.


cyclecamper 17th April 2012 05:29 AM

Sounds like they'd probably work OK as they are. How about some pictures?

TB 17th April 2012 05:29 AM

OK, let's try this:
Other DIY - My Photo Gallery

Pictures are named: 34-step Attenuator. One of them shows comparison with Alps Blue pot. Diameter of the pot is 2", hight 2". It is single gang.
I did try to contact maker of these pots, but I was unable to locate them. Some net search brings their name, but without contact info. I am not sure, but it looks like the wire used instead of resistors is golden plated.

cyclecamper 17th April 2012 05:30 AM


cyclecamper 17th April 2012 05:31 AM

It's 9:30 PM where I am...why does this site say I posted at 4:30 AM? Did I miss setting a time zone parm somewhere in my profile?

TB 17th April 2012 05:49 AM

The time here is: 12:49 AM :D

analog_sa 17th April 2012 07:38 AM


Originally Posted by TB (
I ask $55 per attenuator ( I paid $90 when I bought them ).

Goodness, those marine sharks skinned you alive :)

These look not too different to some of the Daven switches inside. Contact material is quite possibly silver.

Yet the currently produced Shallco seem cheaper, better and fit slim line cases.

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