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4 x JLM BA (Single) in 1U case

PostPosted: Sat May 08, 2010 10:58 pm
by chris p
I'm in the process of building a 2U rack containing 8 x BA Dual pres with metering, so the question is whether I cannibalise my current BA's for the tranny and 99V, or sell the unit as a going concern. So there's four of these pres in a 1U case

* Input transformer JLM 1:4
* Switched variable impedance (150, 300, 600, 1K2 and 2K4 off the top of my head)
* 99V opamp
* 48V pad and phase switches

Comes with JLM 48V supply.

Photo up soon (unless sold before hand).

Offers or swaps in the $1K2 ballpark - its about $800 worth of kit, plus the case and power supply adds another $100 or so, the rest is wires, sockets and assembly.

PostPosted: Mon May 10, 2010 11:34 am
by HA_DA_JA
Any pics of the front and back of the unit would be greatly appreciated.
Cheers

PostPosted: Tue May 11, 2010 9:28 am
by chris p
Front:
Image

Back:
Image

Guts:
Image

NOTE: The variable impedance has 4 positions, not 5 - no 150R, just 300, 600, 1K2 and 2K4

PostPosted: Thu May 20, 2010 8:07 am
by mylesgm
Hi Chris,

This uses the 99v and no output transformer so its unbalanced out correct?

M

PostPosted: Thu May 20, 2010 8:55 am
by chris p
Er, no. The output is balanced electrically. Refer to the schematic one the JLM site, and the strap across the IC pins technique for using a 99V with no transformer.

Oh, and the unit is SOLD. Sorry, should have posted that earlier.