RE: replacing the dual parts with 2604 - Ecaroh - Tweakers' Asylum

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RE: replacing the dual parts with 2604

In Reply to: replacing the dual parts with 2604 posted by 1973shovel on October 28, 2007 at 18:05:53:

> I just ordered some 2604's to use in the MPD. I'm using the 627 modules in my CD player at the moment. I think those op amps Steve used were the cause of the harshness some reviewers found with this phono stage.

> I'll keep you posted.<

Please do.

Are you not planning to replace the single op-amps as well? Those are the ones Steve replaces in the (pricey) upgrade that he does. (Maybe they're solely for the MC circuit??)

BTW, there is something you may want to know before you start on this job. The way the board is built, these op-amps are harder to desolder than most. Per chip there is (I think just one) -- blind hole, or socket, rather than a complete perforation of the board. No doubt there is a formal name for that, but I don't know what it is.

You want to do one of two things. If you can actually determine which hole is the blind one (I'm sure it's at one of the 4 corners), then cut the chip's pin for that hole and desolder the other pins conventionally. Secondly, you can just cut all 8 pins, then heat the holes and remove what's left of each pin with a needlenose.

For the blind hole, you'll have to work from the top, although you can heat from below. There won't be much left of this pin, and you may have to just poke it out with a needle, icepick, etc.

You'll probably be soldering sockets to the board. You'll have to shorten the pin that goes into the blind hole.

Steve.

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Follow Ups Full Thread

Topic - Coupling Cap Value (size matters?) - 1973shovel 05:53:17 10/25/07 (11)

Problem Solved - 1973shovel 08:36:53 10/26/07 (0)

RE: Coupling Cap Value (size matters?) - ChrisVH 08:11:39 10/26/07 (0)

RE: Coupling Cap Value (size matters?) - Ecaroh 23:28:14 10/25/07 (4)

Have you done this? (McCormack Phono) - 1973shovel 05:47:42 10/26/07 (3)

RE: Have you done this? (McCormack Phono) - Ecaroh 14:35:04 10/26/07 (2)

replacing the dual parts with 2604 - 1973shovel 18:05:53 10/28/07 (1)

RE: replacing the dual parts with 2604 - Ecaroh 13:20:44 10/31/07 (0)

Thats up to your ears to decide - Tweekeng 06:26:10 10/25/07 (3)

For better or worse is up to you to decide. - 1973shovel 07:04:55 10/25/07 (2)

RE: For better or worse is up to you to decide. - h_h 08:30:29 10/25/07 (1)

RE: I've got a '77 XLH. - 1973shovel 08:59:37 10/25/07 (0)

Follow Ups

RE: replacing the dual parts with 2604 - Ecaroh 13:20:44 10/31/07 (0)

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