Have you ever seen a 4 pin blue Alps pot??? need help - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 2nd February 2011, 03:07 PM   #1
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
Default Have you ever seen a 4 pin blue Alps pot??? need help

Hi all, A friend gave me a blue Alps pot the other day and I was looking at it this morning and noticed it has 4 pins per side. It is 100k and the model number is RH2702. What is the 4th pin for? How do I wire this thing?

Also, it is a click type, not smooth sweep.
  Reply With Quote
Old 2nd February 2011, 03:53 PM   #2
diyAudio Member
 
kstagger's Avatar
 
Join Date: Dec 2003
Location: Grand Rapids
probably a loudness tap...
  Reply With Quote
Old 2nd February 2011, 06:43 PM   #3
Doz is offline Doz  United Kingdom
diyAudio Member
 
Doz's Avatar
 
Join Date: Jul 2010
Location: Sat Down
Yes, it's a loudness or "bass boost" tap... I have several of the damnedable things, and always manage to wire them up wrong ....
__________________
"To err is human.. to make a real balls-up requires a computer"
  Reply With Quote
Old 2nd February 2011, 06:54 PM   #4
diyAudio Member
 
Miniwatt's Avatar
 
Join Date: Nov 2004
Location: Den Haag
The loudness taps are on the outside if I'm not mistaken.
Are you sure it is a real Alps? I got one of those, it was a stepped attenuator in an Alps housing. But Alps never made those.
  Reply With Quote
Old 2nd February 2011, 07:45 PM   #5
taj is offline taj
diyAudio Member
 
taj's Avatar
 
Join Date: Feb 2005
Found this in a Google search....

Quote:
There's a new and strange fourth choice now. Apparently some company has built a stepped attenuator into a package similar to that of the ALPS Blue Velvet. It's marked as an ALPS pot, but the compnay claims not to know about this part (labeled RH2702) and the web site doesn't have any information on it. One guess is that it's made by a Chinese company called Soundwell. I've measured one, and it's got excellent channel matching. It's a bit tough to turn the knob, and there's a click in between settings unless you turn it quickly, but it fits the board and it's inexpensive. You can buy them for $6 each with a minimum order of 4 by contacting Wai Kei Leung of Wai Yip Electronics, Hong Kong. You should read the Head-Fi thread about these parts before buying.
Don't bother reading that Head-Fi thread, it's linked to the wrong topic (unless you like to read about people buying $6000 headphone amps. Man, I'm in the wrong business.)

..Todd

Last edited by taj; 2nd February 2011 at 07:58 PM.
  Reply With Quote
Old 2nd February 2011, 08:34 PM   #6
diyAudio Member
 
Join Date: Sep 2003
Location: London
I have a few of these which I bought from a US dealer on ebay. Haven't wired one up yet, but I guess a multimeter would tell you which two contacts to join.
  Reply With Quote
Old 2nd February 2011, 09:39 PM   #7
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
Here is a pic of the guts. Yep, not made by ALPS but still looks good.

http://cgi.ebay.com/ALPS-Stepped-100...item19c24250b5
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Alps Blue Velvet 100k volume pot For Sale nikolas812 Swap Meet 1 5th June 2009 10:56 PM
Alps RK27112 10K Motorized Blue Velvet Volume Pot raghoser Parts 4 28th January 2008 02:24 PM
Interesting! ALPS blue velvet pot test results.... ransom peek Chip Amps 7 28th October 2006 04:48 AM
for trade: 3x6922 tubes for one Alps Blue Velvet pot reaction Swap Meet 0 8th July 2004 08:39 PM
WTB: Alps Blue Velvet mono 100K volume pot Derrick Swap Meet 0 16th October 2003 10:41 PM


New To Site? Need Help?

All times are GMT. The time now is 02:46 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2