KLH / Burwen Research 7000A Mods ?

[krazyclocks]

Have three of these units now , been thinking if they could be improved ?
For those not knowing what they are , used for Click / Pop removal from playback of vinyl.
They are fairly good at it but can be better ?

First they use the old 4136 Op amp , with odd pin out , has anyone made an adapter to use something more modern...cheaply ?

What about time constants of action , has anyone messed with to perhaps use multi level of pop /click removal ?

I do not want to reinvent the thing , but with all these DIY people, someone , I would think has tried a few mods ?

Please let me know if any ideas ?

Brian

 

[krazyclocks]

More Info

Well first found these Adaptors :

http://www.cimarrontechnology.com/index.asp?PageAction=VIEWPROD&ProdID=35

Now these seem like right dirrection.

The problem is need simular or less current draw , what has been used , that would be faster & sound better ?

Spec of 4136 :

http://staff.bcc.edu/eet/4136-rca.pdf

Anyone done this ??

Brian

 

[krazyclocks]

Hello

There seems to be at least two versions of these Rev 1 & Rev 2.
The older Rev 1 has better bypass caps slightly differant version ICs etc etc.
The 6 ICs to right are the audio ICs , the first group of 4 are the process to remove / mute the pops.
Would think the ones on left would make no differance in sound quality of unit.
Been looking at subbing the RC4136s & TL082s for OPA2134s.
Pictures:

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Any Ideas / Thoughts ?

Brian