Distortion on quad 34 after switch upgrade

  • No one logged in.

20-Oct-2019 01:00 AM

Mark B

Mark B

Posts: 3

I’ve just done the official dada upgrade to my grey later model quad 34 and it sounded very good indeed. I then upgraded the 5 switches (including the 4016) with max4066a parts. All is basically working but to my possibly fallable ears the unit sounds slightly less good with the new switch ic’s with a tiny bit of treble sibilance and a bit less musicality to the sound. I was rather expecting the reverse! 

Has anyone else experienced this or any ideas... do the switches burn in at all or could they stress the psu? 

Any comments very much appreciated 

cheers

Mark 

  Reply

23-Oct-2019 12:37 PM

Fabian

Fabian

Posts: 102

I am about to upgrade my Quad 34 and will be using the MAX4066 switches. Not the 4066A spec, though.

This will be a complete revision, but I have a second 34 that has already been revised using the same op-amps, but still uses the stock switches.

Let's see what I will find.

  Reply

23-Oct-2019 03:53 PM

Mark B

Mark B

Posts: 3

Hi

I think in fact that it is sounding rather better after a 24 hour soak in with a stream playing through it constantly. 


I will be interested in how you find the max4066 chips, I went for the ’a’ version though I have both because the switch to switch on resistance is better matched (within 2 ohms) and the leakage current much smaller while all other characteristics are matched. I’d be interested in any comments as to why one or the other is better.

I’m intending upgrading another 34 and I’ll leave this minus the switch upgrade whilst I do an extended period of comparative tesing. Will be interesting to see if there is any sonic difference (as against on paper) 


cheers

mark 

  Reply

05-Nov-2019 05:16 PM

Mark B

Mark B

Posts: 3

I thought it would be useful to post my update on this. I have now replaced the maxim chips with sockets and for now replaced the original 4066 and 4016 spec chips, to my mind the distortion is very slightly noticeably higher *but* the overall sound is better re the maxim chips with better stereo staging and a nicer possibly slightly warmer sound. I wonder if the maxim chips handle timing less well and I’d the older chips actually add a low end warmth that the new switches lack. As always ymmv 

  Reply