>" starting with 6V6... 6L6... finally KT88's, then went=20
"solid state" when I went to..." (snipped the part thar fuckd it all up...
I'm currently selling a pair of Chicago BO-15s. Were driven by 6550s, the G=
OOD versoin of the octal tubes. charging a hundred bucks. One guy in Chicag=
o wants them but I haev to shoip them. a local guy is offering half that. M=
aybe I kjust keep them. They are in a pair of monoblocks built by my Uncle.=
I still have the 6550s and the emossion tested fair to good a couple weeks=
ago. They hadn't been lit for ten years so they are probably better than t=
hat indicates, once you warm them up. and the getters are not all that gone=
. They are brown but not flaking off the glass.
The transformers are triple center tapped primary willianson type with four=
and eight secondary taps. the chassis' they are oin now are configured for=
100 watts RMS (yeah I know) into four or eight ohms. The power transformer=
s are bigger thant they are. Which makes sense.=20
One guy offered fifty bucks. No way. hundred bucks her, or forget it. These=
things sounded great and might run, well one of them, if I had all the tub=
es. Well, maybe. Stole a few parts off.=20
You are just an IC away fom a new breed of amp.=20
But I ain't taking fifty bucks.=20
Can we switchmode these things and make them class E or F or someting ?
Reply by ●June 1, 20142014-06-01
Edit button. My Kingdom for an edit button.
Reply by ●June 1, 20142014-06-01
>"For lots of HV applications I'm surprised that no one (*) has thought=20
to put a transistor under the cathode of a tube... a lot more durable=20
that a Power FET.=20
(*) Maybe someone has, somewhere?"
Shut the fuck up if you want to live. those NSA guys don't play around. LOL
Problem is that the temperature at which thermionic emission get going is d=
estructive fro most transistors. for germanium it might be totally impossib=
le, for suilicon nby yhte time you derate it you will not have the power to=
feed a cathode driven amp, which would be the only purpose of suc a circui=
t.=20
Of course emitter turnoff has existed for some time now. when the load is h=
ighly inductive, they will take a transistor and turn it off on the emitter=
of the main transitor. This makes the biug transistor shieild the little e=
mitter transitor from the big bad voltage, but enhances whart REALLY happen=
s between the emitter and base of the big transistor. They actually used it=
in brownware for a short time, for wide screen CRT based projection TVs. t=
ha is until better transistors got ther (the 2SC5588 IIRC). then only the t=
races and silkscreening remain, and of course the one jumper. the drive cir=
cuit still sowed soigns of the scheme. I cna do a screen catpur if you have=
any interest in this, or if you can handle DWG files. Problem is it wasn't=
used in any units I worked on so I don't know how wlell it worked. In fact=
I wouldn't anyeay as I had no tinme for those unprofitable excursions much=
.=20
But yeah, a little shit ass transistor in the emitter circuit that could ha=
ndle the curtrent but not the voltage, wa sturned off as the big transistor=
was tirned off and the cpaacitance of the big transistor aided in its own =
turnoff.=20
Pretty novel little deal, and cheap. Applied to the cheapest pf the cheap t=
o save money on the drive circuit. As I said, better transistors came forth=
and the design was changed to eliminate this drive opitmization as soon as=
it was no longer needed.
Reply by Jim Thompson●June 1, 20142014-06-01
On Sat, 31 May 2014 21:12:30 -0600, Reinhardt Behm
<rbehm@hushmail.com> wrote:
>Jim Thompson wrote:
>
>> My customer bought the MCU core IP from Cadence and I added the signal
>> conditioning around it, with glue logic (and MCU programming) provided
>> by Mark Tse (quite a talent)... who thought I was around 50 years
>> old... and was quite surprised when I told him I was coming up on 72
>> (at that time).
>>
>> Now my next milestone is 3/4C :-D
>>
>> ...Jim Thompson
>>
>
>He was a programmer and probably meant it in hex (72 = 0x48) :-)
>:-}
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Reply by Tim Williams●June 1, 20142014-06-01
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote
in message news:02fko9tn5tntoek65u8a3jdrspa5men65v@4ax.com...
> I have a 6DS4 (RCA Nuvistor) sitting here on my desk... and I've seen
> photos of experimental devices about the size of a surface mount
> capacitor.
>
> For lots of HV applications I'm surprised that no one (*) has thought
> to put a transistor under the cathode of a tube... a lot more durable
> that a Power FET.
>
> (*) Maybe someone has, somewhere?
Tek certainly did it a lot during their hybrid days, but if you mean
co-packed, I can't imagine a 200C bulb temp would be so friendly, even if
the chip is glass passivated (hey, just weld it onto the envelope, who
cares right?).
I've also seen co-pack (or maybe they're actually monolithic?) BJT-MOSFET
cascodes for moderate voltage switching applications, but I haven't
thought of a place they'd be useful.
I used to tell people that an EL519 -- ignoring the heater power, or maybe
not even, depending -- is still several times better than the best
commercially available HV MOSFET. But, now that IXYS has some 2.5kV ~10A
devices, that has also passed.
Tim
--
Seven Transistor Labs
Electrical Engineering Consultation
Website: http://seventransistorlabs.com
Reply by Reinhardt Behm●June 1, 20142014-06-01
Jim Thompson wrote:
> My customer bought the MCU core IP from Cadence and I added the signal
> conditioning around it, with glue logic (and MCU programming) provided
> by Mark Tse (quite a talent)... who thought I was around 50 years
> old... and was quite surprised when I told him I was coming up on 72
> (at that time).
>
> Now my next milestone is 3/4C :-D
>
> ...Jim Thompson
>
He was a programmer and probably meant it in hex (72 = 0x48) :-)
--
Reinhardt Behm
Reply by Jim Thompson●May 31, 20142014-05-31
On Sat, 31 May 2014 18:07:25 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:
>Den s�ndag den 1. juni 2014 02.51.25 UTC+2 skrev Jim Thompson:
>> On Sat, 31 May 2014 14:56:25 -0700 (PDT), Lasse Langwadt Christensen
>>
>> <langwadt@fonz.dk> wrote:
>>
>>
>>
>> >Den l?rdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson:
>>
>> >> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman
>>
>> >>
>>
>> >> <jeroen@nospam.please> wrote:
>>
>> >>
>>
>> >>
>>
>> >>
>>
>> >> >On 31/05/14 19:48, Jim Thompson wrote:
>>
>> >>
>>
>> >> >[...]
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >> That Long Island design was for a clutch controller for heavy
>>
>> >>
>>
>> >> >> trucks... carefully controlled application and release... no jerky
>>
>> >>
>>
>> >> >> starts and wear minimized ;-) The whole world doesn't revolve around
>>
>> >>
>>
>> >> >> 10GHz uP's... there are lots of tasks that don't take that kind of
>>
>> >>
>>
>> >> >> speed. [...]
>>
>> >>
>>
>> >> >> ...Jim Thompson
>>
>> >>
>>
>> >> >>
>>
>> >>
>>
>> >> >
>>
>> >>
>>
>> >> >Haha! That reminds me of a citation I picked up some years ago:
>>
>> >>
>>
>> >> >
>>
>> >>
>>
>> >> >"A slower system like cruise control can typically be handled by
>>
>> >>
>>
>> >> >a mid-level processor such as a 700MHz x86 ..."
>>
>> >>
>>
>> >> >-- Shawn Liu of National Instruments in "Embedded Design", November 2002
>>
>> >>
>>
>> >> >
>>
>> >>
>>
>> >> >Jeroen Belleman
>>
>> >>
>>
>> >>
>>
>> >>
>>
>> >> We did have a clock... 5MHz... divided down to 156kHz for the sampling
>>
>> >>
>>
>> >> (flipping a magnetic sensor and synchronous demod... modeling
>>
>> >>
>>
>> >> mentioned in prior posts ;-)
>>
>> >>
>>
>> >
>>
>> >was it signal conditioning for sensors and power control for actuators?
>>
>> >
>>
>> >I can't imagine anything like that build in this century not controlled by
>>
>> >an MCU.
>>
>> >
>>
>> >-Lasse
>>
>>
>>
>> MCU's can crunch numbers and do sequential things... but they don't do
>>
>> signal conditioning.
>>
>>
>>
>> There was a quasi-MCU included in the chip core... Cadence provided
>>
>> that part, no less >:-}
>>
>
>that's kinda what I meant, no one would do it with out some kind of programmable
>controller so it would have to be front end for an MCU or have an MCU added to the chip
>
>-Lasse
My customer bought the MCU core IP from Cadence and I added the signal
conditioning around it, with glue logic (and MCU programming) provided
by Mark Tse (quite a talent)... who thought I was around 50 years
old... and was quite surprised when I told him I was coming up on 72
(at that time).
Now my next milestone is 3/4C :-D
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Reply by Lasse Langwadt Christensen●May 31, 20142014-05-31
Den s=C3=B8ndag den 1. juni 2014 02.51.25 UTC+2 skrev Jim Thompson:
> On Sat, 31 May 2014 14:56:25 -0700 (PDT), Lasse Langwadt Christensen
>=20
> <langwadt@fonz.dk> wrote:
>=20
>=20
>=20
> >Den l=EF=BF=BDrdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson:
>=20
> >> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman
>=20
> >>=20
>=20
> >> <jeroen@nospam.please> wrote:
>=20
> >>=20
>=20
> >>=20
>=20
> >>=20
>=20
> >> >On 31/05/14 19:48, Jim Thompson wrote:
>=20
> >>=20
>=20
> >> >[...]
>=20
> >>=20
>=20
> >> >>
>=20
> >>=20
>=20
> >> >> That Long Island design was for a clutch controller for heavy
>=20
> >>=20
>=20
> >> >> trucks... carefully controlled application and release... no jerky
>=20
> >>=20
>=20
> >> >> starts and wear minimized ;-) The whole world doesn't revolve arou=
nd
>=20
> >>=20
>=20
> >> >> 10GHz uP's... there are lots of tasks that don't take that kind of
>=20
> >>=20
>=20
> >> >> speed. [...]
>=20
> >>=20
>=20
> >> >> ...Jim Thompson
>=20
> >>=20
>=20
> >> >>
>=20
> >>=20
>=20
> >> >
>=20
> >>=20
>=20
> >> >Haha! That reminds me of a citation I picked up some years ago:
>=20
> >>=20
>=20
> >> >
>=20
> >>=20
>=20
> >> >"A slower system like cruise control can typically be handled by
>=20
> >>=20
>=20
> >> >a mid-level processor such as a 700MHz x86 ..."
>=20
> >>=20
>=20
> >> >-- Shawn Liu of National Instruments in "Embedded Design", November 2=
002
>=20
> >>=20
>=20
> >> >
>=20
> >>=20
>=20
> >> >Jeroen Belleman
>=20
> >>=20
>=20
> >>=20
>=20
> >>=20
>=20
> >> We did have a clock... 5MHz... divided down to 156kHz for the sampling
>=20
> >>=20
>=20
> >> (flipping a magnetic sensor and synchronous demod... modeling
>=20
> >>=20
>=20
> >> mentioned in prior posts ;-)
>=20
> >>=20
>=20
> >
>=20
> >was it signal conditioning for sensors and power control for actuators?
>=20
> >
>=20
> >I can't imagine anything like that build in this century not controlled =
by=20
>=20
> >an MCU.=20
>=20
> >
>=20
> >-Lasse
>=20
>=20
>=20
> MCU's can crunch numbers and do sequential things... but they don't do
>=20
> signal conditioning.
>=20
>=20
>=20
> There was a quasi-MCU included in the chip core... Cadence provided
>=20
> that part, no less >:-}
>=20
that's kinda what I meant, no one would do it with out some kind of program=
mable
controller so it would have to be front end for an MCU or have an MCU added=
to the chip=20
-Lasse
Reply by Jim Thompson●May 31, 20142014-05-31
On Sat, 31 May 2014 14:56:25 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:
>Den l�rdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson:
>> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman
>>
>> <jeroen@nospam.please> wrote:
>>
>>
>>
>> >On 31/05/14 19:48, Jim Thompson wrote:
>>
>> >[...]
>>
>> >>
>>
>> >> That Long Island design was for a clutch controller for heavy
>>
>> >> trucks... carefully controlled application and release... no jerky
>>
>> >> starts and wear minimized ;-) The whole world doesn't revolve around
>>
>> >> 10GHz uP's... there are lots of tasks that don't take that kind of
>>
>> >> speed. [...]
>>
>> >> ...Jim Thompson
>>
>> >>
>>
>> >
>>
>> >Haha! That reminds me of a citation I picked up some years ago:
>>
>> >
>>
>> >"A slower system like cruise control can typically be handled by
>>
>> >a mid-level processor such as a 700MHz x86 ..."
>>
>> >-- Shawn Liu of National Instruments in "Embedded Design", November 2002
>>
>> >
>>
>> >Jeroen Belleman
>>
>>
>>
>> We did have a clock... 5MHz... divided down to 156kHz for the sampling
>>
>> (flipping a magnetic sensor and synchronous demod... modeling
>>
>> mentioned in prior posts ;-)
>>
>
>was it signal conditioning for sensors and power control for actuators?
>
>I can't imagine anything like that build in this century not controlled by
>an MCU.
>
>-Lasse
MCU's can crunch numbers and do sequential things... but they don't do
signal conditioning.
There was a quasi-MCU included in the chip core... Cadence provided
that part, no less >:-}
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| San Tan Valley, AZ 85142 Skype: skypeanalog | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
Reply by Lasse Langwadt Christensen●May 31, 20142014-05-31
Den l=F8rdag den 31. maj 2014 20.29.46 UTC+2 skrev Jim Thompson:
> On Sat, 31 May 2014 20:23:56 +0200, jeroen Belleman
>=20
> <jeroen@nospam.please> wrote:
>=20
>=20
>=20
> >On 31/05/14 19:48, Jim Thompson wrote:
>=20
> >[...]
>=20
> >>
>=20
> >> That Long Island design was for a clutch controller for heavy
>=20
> >> trucks... carefully controlled application and release... no jerky
>=20
> >> starts and wear minimized ;-) The whole world doesn't revolve around
>=20
> >> 10GHz uP's... there are lots of tasks that don't take that kind of
>=20
> >> speed. [...]
>=20
> >> ...Jim Thompson
>=20
> >>
>=20
> >
>=20
> >Haha! That reminds me of a citation I picked up some years ago:
>=20
> >
>=20
> >"A slower system like cruise control can typically be handled by
>=20
> >a mid-level processor such as a 700MHz x86 ..."
>=20
> >-- Shawn Liu of National Instruments in "Embedded Design", November 2002
>=20
> >
>=20
> >Jeroen Belleman
>=20
>=20
>=20
> We did have a clock... 5MHz... divided down to 156kHz for the sampling
>=20
> (flipping a magnetic sensor and synchronous demod... modeling
>=20
> mentioned in prior posts ;-)
>=20
was it signal conditioning for sensors and power control for actuators?
I can't imagine anything like that build in this century not controlled by=
=20
an MCU.=20
-Lasse