Thanks Rudi. I emailed Spencer earlier this morning to see if he can help. If he has them available and others need some I'm happy to go with your suggestion.
Ray
Gary, I have sent you the documentation once more. Please check.
Gentlemen: all of you have paid, and I have already ordered the PCBs.
I will have the PCBs by end of January (I hope that the German tax authority does not interfere with the shipment),
and will then send you the letters immediately.
I have sent the documentation (BoM, schematic, drill-template, TungstenAudios modifications, ..).
You can of course do without his modifications, but you would loose a lot of audible improvements (and Watts!!) then!
If somebody did not yet receive my documentation: please tell me.
Perhaps I have mixed up the EMail address.
In the meantime I like to talk about the ACAs case with you (I Need one myself; my prototype case is very ugly!)
My idea is shown in the attached pictures:
As heatsinks I would like and use Fischer SK 47.
You can get from CONRAD, for example: %product-title% kaufen
Back and Bottom of the case, which I have in mind, are made of 1.5mm ALU plates.
Front and top are made of solid wood (f.e.: pine tree).
I will ask a carpenter-friend of mine, if he will mill front and top.
You can then paint / varnish as you like: black, red, oak, mahagoni, … Build an individual case!
You will have to order / drill the ALU-L profiles and plates yourself. I / my carpenter-friend will give you the dimensions.
I will send you the 2 wooden plates.
This is only an idea. I wonder, if you are interested.
You can as well buy a not-beautiful (in my eyes) case from modushop (dissipante, pesante, …) But: we are DIYers, aren't we?
It depends if my carpenter-friend has the time to do it.
What do you think? - Rudi
Gentlemen: all of you have paid, and I have already ordered the PCBs.
I will have the PCBs by end of January (I hope that the German tax authority does not interfere with the shipment),
and will then send you the letters immediately.
I have sent the documentation (BoM, schematic, drill-template, TungstenAudios modifications, ..).
You can of course do without his modifications, but you would loose a lot of audible improvements (and Watts!!) then!
If somebody did not yet receive my documentation: please tell me.
Perhaps I have mixed up the EMail address.
In the meantime I like to talk about the ACAs case with you (I Need one myself; my prototype case is very ugly!)
My idea is shown in the attached pictures:
As heatsinks I would like and use Fischer SK 47.
You can get from CONRAD, for example: %product-title% kaufen
Back and Bottom of the case, which I have in mind, are made of 1.5mm ALU plates.
Front and top are made of solid wood (f.e.: pine tree).
I will ask a carpenter-friend of mine, if he will mill front and top.
You can then paint / varnish as you like: black, red, oak, mahagoni, … Build an individual case!
You will have to order / drill the ALU-L profiles and plates yourself. I / my carpenter-friend will give you the dimensions.
I will send you the 2 wooden plates.
This is only an idea. I wonder, if you are interested.
You can as well buy a not-beautiful (in my eyes) case from modushop (dissipante, pesante, …) But: we are DIYers, aren't we?
It depends if my carpenter-friend has the time to do it.
What do you think? - Rudi
Attachments
Hi Rudi,
Many thanks I received all the documents, it is highly appreciated.
My biggest problem is getting hold of the 2SK170 or LSK170. The Fetaudio prices are totally insane. Will try other means - might revert to diyAudio store if all else fails. Also can't get the IRFP240 (will check specs of the 250) or 2SC1845 here.
Many thanks I received all the documents, it is highly appreciated.
My biggest problem is getting hold of the 2SK170 or LSK170. The Fetaudio prices are totally insane. Will try other means - might revert to diyAudio store if all else fails. Also can't get the IRFP240 (will check specs of the 250) or 2SC1845 here.
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I ordered a pair from this chap.
Genuine Toshiba 2SK170BLs matched pairs for sale
Rudi has also pointed me at another source so I'll buy a second pair in case I do another ACA.
Did you forget to do currency conversion?
I just checked FET Audio | Hi-End Audio Projects and the price for 4 matched 2sk170BL is $100HKD, which is about $13 USD.
Gentlemen, $13 USD for a matched quad of 2SK170BL (fetaudios offer) is a very good price in my eyes. Take them - if you do not already have.
If you have a couple of 2SK170BL, but are not sure, if they are real (genuine) 2SK170BL (can be LSK170BL as well), please use the schematic shown below.
The shown 10VDC voltage source can be replaced by a 9V battery.
The voltage drop across the 100Ohm resisitor should be in the range from 600mA t0 1200mA (the IDss of a 2SK170BL lies in the range from 6mA to 12mA).
If it is: it is a good sign that the transistor will work and is not a fake.
Best regards - Rudi
If you have a couple of 2SK170BL, but are not sure, if they are real (genuine) 2SK170BL (can be LSK170BL as well), please use the schematic shown below.
The shown 10VDC voltage source can be replaced by a 9V battery.
The voltage drop across the 100Ohm resisitor should be in the range from 600mA t0 1200mA (the IDss of a 2SK170BL lies in the range from 6mA to 12mA).
If it is: it is a good sign that the transistor will work and is not a fake.
Best regards - Rudi
Attachments
Originally Posted by Rudi_Ratlos
...the IDss of a 2SK170BL lies in the range from 6mA to 12mA...
The ACA sounds fine with any idss in the BL range.
And remember, you don't need a matched pair for this amp, so idss can vary a bit between the two JFets. (as TungstenAudio has mentioned in post #10)
.
...the IDss of a 2SK170BL lies in the range from 6mA to 12mA...
The ACA sounds fine with any idss in the BL range.
And remember, you don't need a matched pair for this amp, so idss can vary a bit between the two JFets. (as TungstenAudio has mentioned in post #10)
.
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Oh for f....k sakes,
Do I feel like a total eedjit!! Blind, deaf and a total bloody widget. I hang (and bang) my head in shame. Just saw the $ sign and and well ......
Hi Kevin
You can get two original 2SK170BL's from me. I'll drop it off if you let me know when you are home, or if you prefer, come pick it up.
I don't have 240's, but I know where you can get locally...