KlausDK Posted October 26, 2006 Report Share Posted October 26, 2006 Hi KenI have recently removed and cleaned 4 pollak Rheostats from a early/mid seventies AR-3a with fiberglass filling, picture enclosed. I have cleaned the surface with a "glass-brush" meant for cleaning metal surfaces. You can see symmetric corrossion of the center plate per pair of Rheostats corresponding to the settings of the high and midrange dome tweeters. Otherwise they look to be in reasonable good condition. One of the turning metal things had some rust-like red corrosion. Leedsradio Brooklyn NY has 15 Ohm/25 Watt Rheostats 10 US$http://www.leedsradio.com/Best Regards Klaus Link to comment Share on other sites More sharing options...
Carlspeak Posted October 26, 2006 Report Share Posted October 26, 2006 >Hi Ken>>I have recently removed and cleaned 4 pollak Rheostats from a>early/mid seventies AR-3a with fiberglass filling, picture>enclosed. I have cleaned the surface with a>"glass-brush" meant for cleaning metal surfaces. You>can see symmetric corrossion of the center plate per pair of>Rheostats corresponding to the settings of the high and>midrange dome tweeters. Otherwise they look to be in>reasonable good condition. One of the turning metal things had>some rust-like red corrosion. >>Leedsradio Brooklyn NY has 15 Ohm/25 Watt Rheostats 10 US$>>http://www.leedsradio.com/>>Best Regards KlausThose look cleaned up pretty well and yet there still appears to be severe pitting in the areas circled. I suspect these would still cause problems. Have they?The severity of the pitting also makes me wonder about the 'plating' others have discussed. This looks to go deeper than plating would go and thus represent permanent distruction of the wiping surface. IMO, Ohmites are the way to go. Remember, it's all about the musicCarlCarl's Custom Loudspeakers Link to comment Share on other sites More sharing options...
pmsummer Posted October 26, 2006 Report Share Posted October 26, 2006 Leeds is almost out of the 15 Ohm/25W rheostats (they are probably Ohmites, but the guy on the phone couldn't quite remember). Better order fast if you want some.They're closed on Thursdays, for some odd reason.And one last REALLY cool thing: If you ride your bike to their store in Brooklyn, they give you a free electronic part from their odds and end bin (of your choosing). It's a little far from Dallas, so I passed up that opportunity. Link to comment Share on other sites More sharing options...
kenyonbm Posted October 27, 2006 Report Share Posted October 27, 2006 Thanks Klaus,Those look a LOT better than mine did. The crud was so thick that I was polishing right through the silver plating down to the brass. I will post some pics of my other set when I crack open the other 3a.Can anyone date my 3a's Ser# 25536&7 ?Ken Link to comment Share on other sites More sharing options...
RoyC Posted October 27, 2006 Report Share Posted October 27, 2006 >Can anyone date my 3a's Ser# 25536&7 ?Ken,I believe that would be 1969.Roy Link to comment Share on other sites More sharing options...
charger3834 Posted October 27, 2006 Report Share Posted October 27, 2006 >>Can anyone date my 3a's Ser# 25536&7 ?>>Ken>> I'm thinking 1970. Link to comment Share on other sites More sharing options...
charger3834 Posted October 27, 2006 Report Share Posted October 27, 2006 Stick with Roy. Link to comment Share on other sites More sharing options...
johnieo Posted October 27, 2006 Author Report Share Posted October 27, 2006 >Can anyone date my 3a's Ser# 25536&7 ?>Try June 1969 Link to comment Share on other sites More sharing options...
pmsummer Posted November 1, 2006 Report Share Posted November 1, 2006 >Leeds is almost out of the 15 Ohm/25W rheostats (they are>probably Ohmites, but the guy on the phone couldn't quite>remember). Better order fast if you want some.>Here's the rheostat from Leed's. Link to comment Share on other sites More sharing options...
KlausDK Posted November 1, 2006 Report Share Posted November 1, 2006 I ordered 4 rheostats from Leeds and I had 2 MemCor and 2 Ohmite delivered.BR Klaus Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.