diyAudio Forums Archive > Top > Source > Analogue KLH / Burwen Research 7000A Mods ? - Click HERE for Original Thread 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 Well first found these Adaptors : http://www.cimarrontechnology.com/i...WPROD&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: Any Ideas / Thoughts ? Brian

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