Blue Angel wrote:Hi Iain
I mentioned that I have a TPA12 arm set up and in use for 78rpm shellac. The 'commisioning' of the arm was done in two stages after I acquired it recently. I first made an armboard for it and left the armwiring stock and got everything to work in mono. Since I'm not too familiar with oldtimer wiring, I then decided to add an extra pin on the headshells I have for it, which was fairly straightforward as I have precision turning and milling equipment in my workshop. Following fitting the extra headshell pin, I then re-wired the arm using 4 lengths of very thin armwire with modern colour coding ie Right + red, Right - green, Left + white and Left - blue.
I then fitted a pair of female rca sockets into the TPA12's armboard and soldered the armwires to these, so I could use plugin interconnects without having to mess with a long trailing armlead. For mono, I soldered a bridging wire between R+ and L+. So now I had a TPA12 arm with good quality wiring any monkey could figure what goes where. JoeZ has his own cartridge preference and since I had 3 nos Shure SC35C carts laying around, I modified one with stiffer suspension and sturdier cantilever fitted with a 78profile sapphire stylus which I had in stock. The sapphire will obviously not last as long as diamond but will still play plenty of 78's without damage to my collection.
Yes monkey easy helps!!!! I'll tackle the rewire eventually or send it out for rewire might be a better option.
Blue Angel wrote:I have plenty of photographs of the various changes I made but regrettable don't know how to upload them here. I have uploaded some pics on other forums directly from my own 'gallery' but this doesn't seem to work here.
Do you have a link to those posts? My email is iain42 AT gmail.com .
Blue Angel wrote:Getting to the arm skating across the record: My TPA12 has a knurled wheel on top of the armweight behind the pivot. If you turn the wheel, it acts on a spring underneath, which increases or decreases the VTF (tracking force). I used my electronic scale to set the arm's downforce at 4.5g which gives me very good sound quality and no tracking problems.
Mine has a screw on the top but no matter where it is it skates. I'll have to check under the arm to make sure all is well. The scale currently has it at 11g. Don't worry I tested with throw away vinyl. [/quote]
Blue Angel wrote:Another reason for the arm skedaddling over the record may be that the turntable is perhaps not completely level.
I will check this but now the table is exactly where I first listened to it when it came home and we listened to several Martin Denny records completely.
Blue Angel wrote:Another rather messy job I did right at the start, was
to clean out the old grease in the arm bearings and replaced that with Superlube, a product made in your country. Care should be taken as the ballraces are loose inside and can easily fall all over the place.
I will be careful and I think I've seen the superlube.
Blue Angel wrote:Hope this helps.
Absolutely. You guys have been very patient and helpful with me. Hope I'm not too annoying with all the questions. I researched this one fairly well before posting yet another question.....