Just so everyone known. No more transfers to me, just in case there is another skywa... eh, groupbuy.
jasolnki,
T4, T6, T5 and T7 do not need to be matched.
For everyone also working on an Ono and/or Aleph poweramp, it does make sense to use the simple matching setup as described on PassDIY and have this done with 10 transistorsockets and matched resistors in parallel. Use a powerful lab-powersuply and leave enough space to enable a cover over the transistors to be tested. This will prevent thermal drift with every draft of air coming by or created by the hands moving with measuring leads from one resistor to the next.
A clever setup will allow for IRF 9610/610 and 2SK170 to be tested on the same board (but not at the same time!).
IRF 610 and 9610 are available at graet prices at www.schuro.de. Having plenty of those, matching to 0,01V ist no problem then and will bring optimum performance in any Aleph circuit.
T4, T6, T5 and T7 do not need to be matched.
For everyone also working on an Ono and/or Aleph poweramp, it does make sense to use the simple matching setup as described on PassDIY and have this done with 10 transistorsockets and matched resistors in parallel. Use a powerful lab-powersuply and leave enough space to enable a cover over the transistors to be tested. This will prevent thermal drift with every draft of air coming by or created by the hands moving with measuring leads from one resistor to the next.
A clever setup will allow for IRF 9610/610 and 2SK170 to be tested on the same board (but not at the same time!).
IRF 610 and 9610 are available at graet prices at www.schuro.de. Having plenty of those, matching to 0,01V ist no problem then and will bring optimum performance in any Aleph circuit.
I forgot...
at www.soniccraft.com you can find a good assortment of Black Gate capacitors at fairly good prices...😉
at www.soniccraft.com you can find a good assortment of Black Gate capacitors at fairly good prices...😉
mach.88 said:
Got it. Thanks
I was thinking of building a somewhat elaborate setup that used switches that your allow me to use the same circuit to test the IFRP240, IRF9610, IRF610 and 2SK170. Yes I will be building an Ono in the not too distant future.
I have to get back to waiting by my post box.... the p1.7 pcbs should be arriving any day now.
Guy's
I have an automated matching rig for matching both the To220 or To247 devices. each fet is marked with a 4 digit code that indicates the Ugs (in mV) at the measuring point.
Measurements are taken at 40degrees C and Ugs is measured with 0.01% accuracy.
If we can get a volume of 300 fets or more per type, I could deliver matched IRFP240 or 044 at or about 1,45 euro and an IRF9620 for 0,80 and 610's for 0,70 euro.
Pairs to 1 mV and sets up to 8 matched to 10mV, most likely 5mV.
Anyone interested?
I have an automated matching rig for matching both the To220 or To247 devices. each fet is marked with a 4 digit code that indicates the Ugs (in mV) at the measuring point.
Measurements are taken at 40degrees C and Ugs is measured with 0.01% accuracy.
If we can get a volume of 300 fets or more per type, I could deliver matched IRFP240 or 044 at or about 1,45 euro and an IRF9620 for 0,80 and 610's for 0,70 euro.
Pairs to 1 mV and sets up to 8 matched to 10mV, most likely 5mV.
Anyone interested?
Yes!!!!🙂
I vould be very happy to have 16 IRFP240 at that price. Also a number orf IRF610 and 9610 for Aleph P1.7( for stereo set). If you plan to do that you can count on me! I vould be very greatefull to you.
Marko
I vould be very happy to have 16 IRFP240 at that price. Also a number orf IRF610 and 9610 for Aleph P1.7( for stereo set). If you plan to do that you can count on me! I vould be very greatefull to you.
Marko
i am also in for matched IRF610 and 9610 sets for Aleph P1.7. In total for 4 boards (1 board is 4x IRF 610 and 2x IRF9610).
Tarasque,
don´t know who provides your transistors but maybe you should contact www.schuro.de. They have fair prices on International Rectifier IRF 610, IRF 9610 and IRFP 240.
I bought large numbers of each but lack this supercomfortable automatic matching rig of yours...🙁
...wish you could run them for me... I wonder how much this would cost me
don´t know who provides your transistors but maybe you should contact www.schuro.de. They have fair prices on International Rectifier IRF 610, IRF 9610 and IRFP 240.
I bought large numbers of each but lack this supercomfortable automatic matching rig of yours...🙁
...wish you could run them for me... I wonder how much this would cost me
Tarasque:
I'm interested! I purchased two sets of the Aleph P 1.7 PCBs but have not received them yet and don't have a parts list. I'd be thrilled to buy whatever MOSFETs or other parts you can match that are needed on the PCBs.
Regards,
Scott
I'm interested! I purchased two sets of the Aleph P 1.7 PCBs but have not received them yet and don't have a parts list. I'd be thrilled to buy whatever MOSFETs or other parts you can match that are needed on the PCBs.
Regards,
Scott
Ok.
I'm in for matched 610s and 9610s for "my" four pcb-sets (eight channels and psus) and an extra 6pc of matched IRF9610 for a mini Aleph.
I'm in for matched 610s and 9610s for "my" four pcb-sets (eight channels and psus) and an extra 6pc of matched IRF9610 for a mini Aleph.
Boards received
Veteran,
I have received my boards. The workmanship is great. Can't be beat for the price. Thanks for doing this again.
A side note, should have bought more, but I do not have that many rooms to put the amp in.
Veteran,
I have received my boards. The workmanship is great. Can't be beat for the price. Thanks for doing this again.
A side note, should have bought more, but I do not have that many rooms to put the amp in.
Matching Mosfets
All,
The prices in my example were based on a batch of 300 per type.
From my experience 95% of the devices can be used.
If the batch goes smaller, the number of usefull devices drops rapidly. If you are willing to buy the left overs as well, I'm willing to match the FETS for those interested.
The other option is that I buy 200 of the 610 and 100 of the 9610.
I match these to 1mV and the price will be 2 euro a pair, excluding shipping. I will take the orders as they come in. If you want 1 pair that is OK. You want more, that is OK to. The risk of the left-overs is then mine.
Pls let me know how this looks. I would like to buy the fets in the next week or so.
All,
The prices in my example were based on a batch of 300 per type.
From my experience 95% of the devices can be used.
If the batch goes smaller, the number of usefull devices drops rapidly. If you are willing to buy the left overs as well, I'm willing to match the FETS for those interested.
The other option is that I buy 200 of the 610 and 100 of the 9610.
I match these to 1mV and the price will be 2 euro a pair, excluding shipping. I will take the orders as they come in. If you want 1 pair that is OK. You want more, that is OK to. The risk of the left-overs is then mine.
Pls let me know how this looks. I would like to buy the fets in the next week or so.
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