Mods? How crazy do you want to get? Add caps to the power supply? Swap transistors in the front end? Rebuild it as an X? (Don't take me up on that last one. I've got too many projects on my plate already.)
The amp can be bridged by inverting the input to one channel and using the positive outputs <i>only</i>. Leave the negative outputs alone. The power will be x4 until you exceed the available current; it's a good idea to stick with 8 ohm loads so that this dosn't happen too quickly.
I've got two of the original S-500s. They make good low frequency amps. The mids and highs are a little cloudy, but still match or exceed a number of the units on the market today. Ditto for imaging and detail retrieval.
Grey
The amp can be bridged by inverting the input to one channel and using the positive outputs <i>only</i>. Leave the negative outputs alone. The power will be x4 until you exceed the available current; it's a good idea to stick with 8 ohm loads so that this dosn't happen too quickly.
I've got two of the original S-500s. They make good low frequency amps. The mids and highs are a little cloudy, but still match or exceed a number of the units on the market today. Ditto for imaging and detail retrieval.
Grey
I have a nice fix for that: new front end and higher bias.
I believe I've already posted the last (never to be produced)
front end for the Stasis series, delivered as I walked out
the door.
If you can't find the reference, let me know and I'll repost it.
It was remarkable for being totally DC coupled with almost no
drift at all and was improved in every respect over its
predecessors.
I believe I've already posted the last (never to be produced)
front end for the Stasis series, delivered as I walked out
the door.
If you can't find the reference, let me know and I'll repost it.
It was remarkable for being totally DC coupled with almost no
drift at all and was improved in every respect over its
predecessors.
Yep, I was walking out the door about then, and this would
be the last piece of schematic I left, along with my white
paper "IGBT's: Threat or Menace"
Yeah, I know, I really amuse myself with that kind of humor.
I believe this schematic made it into some updates, but not
production. Its primary virtue was that there was almost
no thermal drift, as all the temperature coefficients of each
component were carefully measured and calculated and the
circuit was designed to null the PN junction drift throughout.
be the last piece of schematic I left, along with my white
paper "IGBT's: Threat or Menace"
Yeah, I know, I really amuse myself with that kind of humor.
I believe this schematic made it into some updates, but not
production. Its primary virtue was that there was almost
no thermal drift, as all the temperature coefficients of each
component were carefully measured and calculated and the
circuit was designed to null the PN junction drift throughout.
April 17 1990.
Thats a while go now, quite a few millcentons (Vulcan calander)
"IGBT's: Threat or Menace"
So what was the paper pointing out, or did you build a better mouse trap?
Ian
Thats a while go now, quite a few millcentons (Vulcan calander)
"IGBT's: Threat or Menace"
So what was the paper pointing out, or did you build a better mouse trap?
Ian
The paper discussed the difficulties of matching the
devices due to their dual device nature and the
inability to bias the mosfet part of the part at a
greater current than the Base current of the Bipolar
part. In an ordinary circuit, the driver is biased at
higher than the draw of the following part, which
improves the linearity and speed.
devices due to their dual device nature and the
inability to bias the mosfet part of the part at a
greater current than the Base current of the Bipolar
part. In an ordinary circuit, the driver is biased at
higher than the draw of the following part, which
improves the linearity and speed.
How would I do it. Reverse the inut of channel 2 and add to channel 1? Illenema@yahoo.comGRollins said:
Nelson Pass said:
Nelson,
This all looks very interesting, however do you have a schematic
that you can provide that covers the circurity on both headers.
I have an S300 I would like to try this out on.
Regards
Jim Wilson
I don't want to be the guy doing everything here....
Anybody want to mate this front end to a Stasis output
stage for Jim?
Anybody want to mate this front end to a Stasis output
stage for Jim?
Mr. Pass,
Speaking of which I just found the schematic of the Nakamichi PA-7, which I believe you designed a few years ago........
Jam
P.S. Nice use of transistors strapped to provide a voltage reference. Do they have lower noise than a zener?
Speaking of which I just found the schematic of the Nakamichi PA-7, which I believe you designed a few years ago........
Jam
P.S. Nice use of transistors strapped to provide a voltage reference. Do they have lower noise than a zener?
You are assuming I have a schematic of this amp, as if
Nakamichi sent me one. Keep in mind that this was
primarily a licensing deal, and Nak was/is free to do what
they like, particularly as Threshold doesn't appear to
exist any longer and the patent is expired.
pass/ - he's listening to Rasa Exotica, which Jam would
probably like.
Nakamichi sent me one. Keep in mind that this was
primarily a licensing deal, and Nak was/is free to do what
they like, particularly as Threshold doesn't appear to
exist any longer and the patent is expired.
pass/ - he's listening to Rasa Exotica, which Jam would
probably like.
Mr.Pass,
I shall send the schematic along to you, if only for sentimental reasons.
Jam
P.S. Rasta Exotica ... is that like New Age Regge?
I shall send the schematic along to you, if only for sentimental reasons.
Jam
P.S. Rasta Exotica ... is that like New Age Regge?
Actually, I think I do have a copy, which you sent me
previously, thanks very much.
No, more like Indian Lounge.
pass/ - having fun signing off like halo
previously, thanks very much.
No, more like Indian Lounge.
pass/ - having fun signing off like halo
You are feeling sleepy!
Yeah! Halo is having far too much influence on members of this fourm......
Jam
Yeah! Halo is having far too much influence on members of this fourm......
Jam
Re: You are feeling sleepy!
Not a bad thing IMHO... and now that he is enlightened his content has risen dramatically...
dave
jam said:
Not a bad thing IMHO... and now that he is enlightened his content has risen dramatically...
dave
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