ok, lets do it
title suggestion
Your F5 parts
reason, I would like it to be based on what kind of parts are being used
would be nice with pictures too
then I think questions comes natural
but the foundation should be members showing what kind of components are being used
even simple resistors
title suggestion
Your F5 parts
reason, I would like it to be based on what kind of parts are being used
would be nice with pictures too
then I think questions comes natural
but the foundation should be members showing what kind of components are being used
even simple resistors
ok
http://www.diyaudio.com/forums/pass-labs/183348-f5-components-parts-you-use.html#post2472271
http://www.diyaudio.com/forums/pass-labs/183348-f5-components-parts-you-use.html#post2472271
Hi tinitus
Are you going to start that tread or woud some one else volunteer?
I await your listening comments. You'll love it!
Russellc
You're not wrong Russell. I've been listening for a week now and I really like this amp. I was expecting a big difference after using an Aleph 5 for the last few years what with the lower gain but its only a couple of clicks on the volume control and the lower power still goes plenty loud enough to elicit a " turn it down" response from my wife.
You're not wrong Russell. I've been listening for a week now and I really like this amp. I was expecting a big difference after using an Aleph 5 for the last few years what with the lower gain but its only a couple of clicks on the volume control and the lower power still goes plenty loud enough to elicit a " turn it down" response from my wife.
I would love to do an Aleph, very nice. Yes, a couple more clicks usually does it. Something bothered me at first about the limited absolute volume (with B-1 anyway) but if "absolute" volume is louder than you need (which it is) whats the trouble? Plus, it sounds great. Glad you like it, I've yet to see an unenthusiastic response on the F-5.
Russellc
Hey folks, sad news: I just had for the first time a faked 2SJ74BL in my hand.
Sad to see that now also these are faked, although there must be plenty of genuine stock available.
The parts I got all had the batch code 7C, had matte faces that looked like the original marking on its face was removed with acid. All parts had an IDSS far above the usual values for BLs, about 20mA.
I didn't have time so far to test for transconductance, but I would expect a low transconductance part anyway.
Beware, I got mine from a usually very trustfull supplier from Europe, not from some doubtfull source from far away.
So take care, Hannes
Sad to see that now also these are faked, although there must be plenty of genuine stock available.
The parts I got all had the batch code 7C, had matte faces that looked like the original marking on its face was removed with acid. All parts had an IDSS far above the usual values for BLs, about 20mA.
I didn't have time so far to test for transconductance, but I would expect a low transconductance part anyway.
Beware, I got mine from a usually very trustfull supplier from Europe, not from some doubtfull source from far away.
So take care, Hannes
> there must be plenty of genuine stock available.
Then you know something that I don't.
ZhouFang couldn't get any at an affordable price. My German suppliers ran out. My Japanese supplier is rationing them 10 pieces max per person. If you can still find a few thousands of them for less than 1USD, I am the first one who wants to know.
Of course we can all wait for Linear Systems for their LSK74s, like we did for the last 4 years or so ?
Patrick
Then you know something that I don't.
ZhouFang couldn't get any at an affordable price. My German suppliers ran out. My Japanese supplier is rationing them 10 pieces max per person. If you can still find a few thousands of them for less than 1USD, I am the first one who wants to know.
Of course we can all wait for Linear Systems for their LSK74s, like we did for the last 4 years or so ?
Patrick
> there must be plenty of genuine stock available.
Of course we can all wait for Linear Systems for their LSK74s, like we did for the last 4 years or so ?
Patrick
Are they actually going to make them?
Ooops!
I would never have imagined that the distributor pipelines would run dry so quickly, this part was in full production until a few years ago. The decline has gone even faster than for the silicon tubes 2SK389/2SJ109, crazy.
Hannes
Maybe a lot of people of hoarding them. I can't imagine that many have been used in products and diy projects. I also don't understand why Toshiba discontinued them when there's a demand for them. You'd think they'd have a replacement that's even better.
I also don't understand why Toshiba discontinued them when there's a demand for them.
Volume wise, audio products are not a demand for a semi manufacturer.
Could you post some pics, so we would be "trained" to identify them?Hey folks, sad news: I just had for the first time a faked 2SJ74BL in my hand.
Sad to see that now also these are faked, although there must be plenty of genuine stock available.
The parts I got all had the batch code 7C, had matte faces that looked like the original marking on its face was removed with acid. All parts had an IDSS far above the usual values for BLs, about 20mA.
I didn't have time so far to test for transconductance, but I would expect a low transconductance part anyway.
Beware, I got mine from a usually very trustfull supplier from Europe, not from some doubtfull source from far away.
So take care, Hannes
Thanks in advance, regards
Volume wise, audio products are not a demand for a semi manufacturer.
Isn't audio pretty much their only use?
How many million jFETs can be produced if the production line is moved to jFETs for one day?
What special procedures need to be on line for that run? How often will that run need to be repeated?
Can we adjust our production methods so that we can cheaply do a 2hr run for the jFET that is coming out?
**** this, we can make more money producing switching mosFETs
What special procedures need to be on line for that run? How often will that run need to be repeated?
Can we adjust our production methods so that we can cheaply do a 2hr run for the jFET that is coming out?
**** this, we can make more money producing switching mosFETs
Could you post some pics, so we would be "trained" to identify them?
I'll give it a try, but it's already not so easy to see with plain eyes, likely much harder to make a good photo.
Anyway, if one gets such a suspicious part into his hands, damage is already done.
Hannes
well,I can't fully agree on the last thing. You can actually avoid using themI'll give it a try, but it's already not so easy to see with plain eyes, likely much harder to make a good photo.
Anyway, if one gets such a suspicious part into his hands, damage is already done.
Hannes
- Home
- Amplifiers
- Pass Labs
- F5 power amplifier