Mounting a Technics EPA 250....

[JP]

It’s not like there is a magical wardrobe filled with them out there……

Well, not filled, exactly.

 

[Ingenieur]

It’s not like there is a magical wardrobe filled with them out there……

I'm guessing @JP has 3 of them
Primary
Back up
Just in case

 

[JP]

4.5, I think.

 

[240sx4u]

4.5, I think.

Alright I give, what's the .5? haha

 

[JP]

The CW broke part of the plastic damping outer chamber where the cage inserts. I made it worse when I tried to swap one in from a spare parts unit. I need to harden a spring and fabricate a bellows to fix it. It’s pretty low on a very long list.

 

[240sx4u]

The CW broke part of the plastic damping outer chamber where the cage inserts. I made it worse when I tried to swap one in from a spare parts unit. I need to harden a spring and fabricate a bellows to fix it. It’s pretty low on a very long list.

Yeah there's no shortage of broken stuff around here either. I get that completely.

 

[JP]

I’d want to get something like my kenwood optical cartridge going first, and I don’t even remember where that is.

 

[Thermionics]

4.5, I think.

Now I know who to pester if I get a hankerin' for an EPA arm...

 

[240sx4u]

I’d want to get something like my kenwood optical cartridge going first, and I don’t even remember where that is.

Alright, you got a chuckle out of me. haha

If you have a G you can live without, let me know. I'm not exactly pining for one but I guess I might as well ask.

 

[S0und Dragon]

 

[Ingenieur]

4.5, I think.

I measured tonearm C yesterday.
Can't vouch for accuracy, Fluke 87 V.
Lowest scale nF

Removed head shell
3' of BJC LC1 reportedly ~40 pF, which alone read ~0.04 nF.
With arm bounced 0.06 - 0.07, dwelled on 0.07 nF. Safe to say <0.08 nF w/o head shell leads? So arm ~ 0.3-0.04 nF, 30-40 pF

 

[JP]

I measured tonearm C yesterday.
Can't vouch for accuracy, Fluke 87 V.
Lowest scale nF

Removed head shell
3' of BJC LC1 reportedly ~40 pF, which alone read ~0.04 nF.
With arm bounced 0.06 - 0.07, dwelled on 0.07 nF. Safe to say <0.08 nF w/o head shell leads? So arm ~ 0.3-0.04 nF, 30-40 pF

Doing the transistor checker hack, I get 18pF for an EPA-100MK2, and 43pF when I hang 1m of LC-1 off it. That'd put my normal setup around 65pF worst-case (8" of my balanced cable equates to about 1M of LC-1), but the cartridge measurements don't bear that out. This is why I want to do it differently, and measure it as a system.

 

[JP]

I measured tonearm C yesterday.
Can't vouch for accuracy, Fluke 87 V.
Lowest scale nF

Removed head shell
3' of BJC LC1 reportedly ~40 pF, which alone read ~0.04 nF.
With arm bounced 0.06 - 0.07, dwelled on 0.07 nF. Safe to say <0.08 nF w/o head shell leads? So arm ~ 0.3-0.04 nF, 30-40 pF

Also note that if I connect a lead at either end of the DUT I go from 43pF to 60pF.

 

[Ingenieur]

Also note that if I connect a lead at either end of the DUT I go from 43pF to 60pF.

DUT?
So it reads different from each end?
Or both leads at same end ~ 43, a lead at each end ~ 60.
Weird

 

[JP]

Device under test. The latter.

 

[240sx4u]

So I did end up with an armwand for the 250. Can anyone tell me what alignment Technics used on this arm? I really want a tool that can show me the correct OEM way to set it up!

 

[mackat]

So I did end up with an armwand for the 250. Can anyone tell me what alignment Technics used on this arm? I really want a tool that can show me the correct OEM way to set it up!

Overhang is 15mm, which should be the standard Technics distance of 52mm from headshell collet to stylus.

I believe Technics uses a modified Stevenson geometry.

 

[240sx4u]

Overhang is 15mm, which should be the standard Technics distance of 52mm from headshell collet to stylus.

I believe Technics uses a modified Stevenson geometry.

Thanks!