Burson op amps for MH DAC23.2

[02audionoob]

I think I go with your advise and start with the 627s. Would be nice to hear a modded one first but what the heck, you only live once.

02audionoob, did you buy your MH CD-25 already modded or did you sent it in after purchase? I'm curious in your opinion of the sonic improvement if you had a chance to hear it unmodded.

I bought mine modded, so I haven't heard it without the 627's. When I got it I opened it up to look at the mods and my memory is they were in sockets.

I think this CD-25 sounds beautiful and I might eventually take it off of the DAC. My original reason for the DAC is more for the DVD player. I love my concert videos.

[Luvin Da Blues]

Thanks gents,

I'm in no rush to order these but I'll post my findings after the swap.

[Luvin Da Blues]

Just took a look inside. Appears to have two 2134s and one 2064. Forgive my ignorance, but are the two 2134s to allow for the inverted balanced signal? Should I replace all three?

[Feanor]

Just took a look inside. Appears to have two 2134s and one 2064. Forgive my ignorance, but are the two 2134s to allow for the inverted balanced signal? Should I replace all three?

LDB, did you mean 2604 rather than 2064? Methinks so.

To my very limited knowledge both the 2134 and 2604 are opamps designed with audio in mind and aren't to shabby, especially the 2134. But, N.B., both types are dual opamps and can't be replaced with single OPA627's.

Almost certainly the 2134's are for the balanced output circuitry. I don't know but would guess that the 2604 is upstream of the 2134's and thus might be first priority. If you want OPA627's you'll need a pair of OP627's and a special adaptor. I believe Parts Connexion sells the adoptors but note that the adaptors might require the surface mount version of the 627 and these are extremely tiny and difficult to work with I dare say.

02audionoob's suggestion is a good one. Email Parts Connexion and ask them if they can upgrade your DAC and what they suggest -- quaranteed they will say 'Yes' and suggest a lot of stuff, likely including the opamps. Ask them specifically about the opamps mentioning what you did here.

A possible source for the pairs of 627 in adaptors is Gigalab on eBay. Assuming they aren't fake 627, these look like a bargain at around US$30 per pair on the adaptor, shipping included.

[Luvin Da Blues]

I think I found it. Is this what your talking about?

http://cgi.ebay.ca/2x-Mono-to-Dual-O...d=p3286.c0.m14

Looks like a dual "pair". Should I replace the 2134s with these and move one 2134 into the 2604 slot?

[Feanor]

I think I found it. Is this what your talking about?

http://cgi.ebay.ca/2x-Mono-to-Dual-O...d=p3286.c0.m14

Looks like a dual "pair". Should I replace the 2134s with these and move one 2134 into the 2604 slot?

I was thinking of this one from Gigawork, (sorry not Gigalab), but the one from Vintage Audio Lab should be the same.

[Luvin Da Blues]

I was thinking of this one from Gigawork, (sorry not Gigalab), but the one from Vintage Audio Lab should be the same.

Ordered the burr-browns from Gigaworks, for this price what's a fellow got to lose.. Thanks guys, I'll post my findings later.