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AKSA's Lender Preamp with 40Vpp Ouput GB
AKSA's Lender Preamp with 40Vpp Ouput GB
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Old 30th May 2018, 10:42 AM   #391
maty tinman is offline maty tinman  Spain
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Quote:
Originally Posted by xrk971 View Post
...I am using an RK09 Alps pot from my pocket amp and attached a short piece of vinyl tubing to allow the shaft to be operated from the front...
What do you -and others- think about Vishay Cermet pots?
https://www.mouser.es/ProductDetail/...bnxw7aa6tIg%3d

https://www.mouser.es/datasheet/2/42...11a-239880.pdf

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Cermet potentiometers – Audial

Quote:
Cermet potentiometers of course are not new, but are still relatively unknown. The reason they are used in the Model A is simple: they are sonically clearly superior to any other potentiometer type.

Still, they (apart form being somewhat fragile) have one shortcoming too: low level inter-channel miss-tracking. I am not aware if this was discussed previously anywhere, so more information on this follows...

Last edited by maty tinman; 30th May 2018 at 10:44 AM.
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Old 31st May 2018, 01:43 AM   #392
xrk971 is online now xrk971  United States
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AKSA's Lender Preamp with 40Vpp Ouput GB
Another Aksa Lender Preamp is born! Congrats to Jwarch for his new preamp.

AKSA's Lender Preamp with 40Vpp Output

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Old 31st May 2018, 03:48 AM   #393
xrk971 is online now xrk971  United States
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AKSA's Lender Preamp with 40Vpp Ouput GB
Here is an alternative heatsink for the the Aksa Lender HPA with higher bias current and 2SA1837. Temps now 67C.

AKSA's Lender Preamp with 40Vpp Output-heatsinks-aksa-lender-pre-hpa-jpg
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Old 15th June 2018, 02:28 PM   #394
JPS64 is offline JPS64  Germany
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AKSA's Lender Preamp with 40Vpp Ouput GB
Starting with preamplifier...


Waiting for some components...


Ill write an illustrated manual...


Enclosure from HIFI2000 (24).


JP
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Old 15th June 2018, 03:22 PM   #395
xrk971 is online now xrk971  United States
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AKSA's Lender Preamp with 40Vpp Ouput GB
Nice case there, JPS64. Where did you get the fancy heatsink bar for the outputs? I twill be good to see how the creator of the layout assembles the final product with input selector board and extended shafts for selectors.
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Old 15th June 2018, 03:31 PM   #396
pcgab is online now pcgab  United States
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AKSA's Lender Preamp with 40Vpp Ouput GB
Looks awesome JP, very similar to my layout plans. Yours is more compact certainly.

I didn't notice the heatsinks until X mentioned them, are they available online somewhere?
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Old 15th June 2018, 04:03 PM   #397
JPS64 is offline JPS64  Germany
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AKSA's Lender Preamp with 40Vpp Ouput GB
The heatsinks are custom made and if fullfilling Ill produce a batch.


Ive to find a solution to bring RK09 on the same line as the input selector (delta is 7.9mm).



JP
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Old 15th June 2018, 05:47 PM   #398
Vunce is offline Vunce  United States
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AKSA's Lender Preamp with 40Vpp Ouput GB
JP,
Your case and layout looks very sleek
Hopefully, the DB heatsinks will work well, Id be interested in those for sure.
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Old 15th June 2018, 07:10 PM   #399
jwjarch is online now jwjarch  United States
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Great to see the layout master building his own, JP! Let us know how the rca's work out for you. The ones I have are too close together for the nuts to screw on. Good luck with your build!
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