Hilarious

[Watson A.Name - \Watt Sun, the Dark Remover\]

I have the 1964 "GE Transistor Manual". It shows some output stages
using both an output transformer and a driver transformer. But it
also shows some totem pole outputs using all PNPs, but with some
small-signal NPNs in the signal path.

The only old RCA manuals I have are either CMOS or tooobz ;-)

...Jim Thompson
--

Some of the higher power amps of that era used a pair of the same
transistors in the output, with a driver transformer, dual secondaries
each driving a base with opposite polarity. The primary was driven
thru a blocking capacitor, to keep DC out of the transformer for best
linearity. I think the Pilot and Acoustic Research amps used this
method. At higher power, the bias stability was of a concern, so using
a low resistance secondary winding helped a lot. Of course they had
some kind of thermal compensation such as a NTC thermistor.
Also, using a transformer prevented blown output transistors from taking
the driver(s) with them.

 

[Jim Thompson]

Back in high school, I knew a guy who had a Renault Dauphine and he was
6 foot 8.

I seem to recall that the driver's seat would slide all the way back
until it touched the rear seats.

I could never figure that out. Today most people wouldn't be
caught dead with a French car. Next to the Yugo...

The French USED TO BE our friends.

The Delco 2N278 TO-36 on a big heatsink, and a big choke were standard
on the back of those GM radios of those years. I replaced quite a few
of those transistors, got a lot of white silicone goop on my hands.
Screwed up an occasional mica washer, too.

My father-in-law-to-be ran a machine shop. He took a big piece of
1/2" aluminum and machined me a perfect mounting surface depression
with perfectly aligned holes.

About the same time I discovered that my wife-to-be knew how to work
on car transmissions ;-)

I hated to work on Caddy radios because of all the air conditioning
ducts that were in the way. Since it was a class A circuit, with heavy
collector current, the germanium trtansistors tended to get out of hand
when the environment get hot. Did you notice in the schematic in the
URL above, that the DC was also across the headphones? I don't think
I'd like to have DC thru a pair of headphones, they might singe my ears!
Someone should've put a 1000 uF cap in series with the headphone jack.

...Jim Thompson

 

[Jan Panteltje]

**** Post for FREE via your newsreader at post.usenet.com ****

Before my time but I would have expected to see transformers at every
turn, considering the high price of trs then. Well, either that or
valves - somewhere I've got an oldie proudly badged as 'transistor',
and yes, it contains 4 or 5 valves.

I would go for a quite different germanium design myself though. Class
B output pair driven by an LM324, nothing else, no biasing. Works very
nicely. People always think it will distort badly but it doesnt. Took
me a bit of thinking to figure out why.


Regards, NT

Here is a link and a picture of the kit:
http://www.wimb.net/index.php?s=electr&page=1
It is step 4, someone gave one to me.
Note the 150 Ohm speaker.
Not very load, but usable.
Regards
JP

For the curious, and for old times sake, look at the old 402 coil here:
http://www.positronic.demon.nl/M58/UM58.html

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[Roger Gt]

X-No-Archive: yes
"Watson A.Name - wrote
: "Jim Thompson" wrote
: > "Tam/WB2TT" wrote
: > >"Jim Thompson" wrote
: > >> Stumbled onto the following URL...
:

http://semiconductormuseum.com/ConstructionProjects/ConstructionP

roject
: s_Penfield_MiniAmp.htm
: > >>
:>>> This is personally hilarious to me since Paul Penfield was
one of my
:>>>(very excellent) instructors at MIT... but he taught field
theory at
:>>> the time... I didn't know he had dabbled in audio.
:>>> ...Jim Thompson

: > >Jim,
: > >Genuinely odd. I have never seen an amp of that era before
that did
: not use
: > >a transformer coupled speaker. Wonder if these speakers were
: originally
: > >special built to handle the DC, and also higher impedance. 40
Ohms
: comes to
: > >mind. I notice the volume control is connected in a
conventional
: manner;
: > >didn't they use to turn it around because of the relatively
low base
: input
: > >impedance?
: > >
: > >I have a 1962 Lafayette Electronics catalog. Sometimes fun to
look
: at.
: > >
: > >B&G Merlot, 2002. 1.5L for 10.99
: > >
: > >Tam
: > >
: >
: > Back then I built a class-A amplifier for my '61 Renault
Dauphine
: > using one of those Delco door-knob Ge power devices. I used a
choke
: > load and capacitively coupled to the speaker. Actually
sounded pretty
: > decent.
: >
: > ...Jim Thompson
: > --
:
: Back in high school, I knew a guy who had a Renault Dauphine and
he was
: 6 foot 8. I could never figure that out. Today most people
wouldn't be
: caught dead with a French car. Next to the Yugo...
:
: The Delco 2N278 TO-36 on a big heatsink, and a big choke were
standard
: on the back of those GM radios of those years. I replaced quite
a few
: of those transistors, got a lot of white silicone goop on my
hands.
: Screwed up an occasional mica washer, too.
:
: I hated to work on Caddy radios because of all the air
conditioning
: ducts that were in the way. Since it was a class A circuit,
with heavy
: collector current, the germanium transistors tended to get out
of hand
: when the environment get hot. Did you notice in the schematic
in the
: URL above, that the DC was also across the headphones? I don't
think
: I'd like to have DC thru a pair of headphones, they might singe
my ears!
: Someone should've put a 1000 uF cap in series with the headphone
jack.



The Renault was really cheap. They cost about $1200 which would be
about $8,000 today. A lot of people thought a scooter would save
them money! LOL

My experience with Ge Transistors was mostly 2N441 "door Knobs"
with 2N465 drivers. We made 1KW frequency changers for driving
aircraft equipment in a test lab. Among other power and signal
equipment with Ge PNP simi-conductors predominant. You know
2N404, 2N1302,4,6 etc. Some systems used thousands of 2N404's and
2N1302's. With a cabinet as big as a coffin!

Roger G

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

X-No-Archive: yes
"Watson A.Name - wrote
: "Jim Thompson" wrote
: > "Tam/WB2TT" wrote
: > >"Jim Thompson" wrote
: > >> Stumbled onto the following URL...
:
roject
: s_Penfield_MiniAmp.htm
: > >>
:>>> This is personally hilarious to me since Paul Penfield was
one of my
:>>>(very excellent) instructors at MIT... but he taught field
theory at
:>>> the time... I didn't know he had dabbled in audio.
:>>> ...Jim Thompson

: > >Jim,
: > >Genuinely odd. I have never seen an amp of that era before
that did
: not use
: > >a transformer coupled speaker. Wonder if these speakers were
: originally
: > >special built to handle the DC, and also higher impedance. 40
Ohms
: comes to
: > >mind. I notice the volume control is connected in a
conventional
: manner;
: > >didn't they use to turn it around because of the relatively
low base
: input
: > >impedance?
: > >
: > >I have a 1962 Lafayette Electronics catalog. Sometimes fun to
look
: at.
: > >
: > >B&G Merlot, 2002. 1.5L for 10.99
: > >
: > >Tam
: > >
: >
: > Back then I built a class-A amplifier for my '61 Renault
Dauphine
: > using one of those Delco door-knob Ge power devices. I used a
choke
: > load and capacitively coupled to the speaker. Actually
sounded pretty
: > decent.
: >
: > ...Jim Thompson
: > --
:
: Back in high school, I knew a guy who had a Renault Dauphine and
he was
: 6 foot 8. I could never figure that out. Today most people
wouldn't be
: caught dead with a French car. Next to the Yugo...
:
: The Delco 2N278 TO-36 on a big heatsink, and a big choke were
standard
: on the back of those GM radios of those years. I replaced quite
a few
: of those transistors, got a lot of white silicone goop on my
hands.
: Screwed up an occasional mica washer, too.
:
: I hated to work on Caddy radios because of all the air
conditioning
: ducts that were in the way. Since it was a class A circuit,
with heavy
: collector current, the germanium transistors tended to get out
of hand
: when the environment get hot. Did you notice in the schematic
in the
: URL above, that the DC was also across the headphones? I don't
think
: I'd like to have DC thru a pair of headphones, they might singe
my ears!
: Someone should've put a 1000 uF cap in series with the headphone
jack.



The Renault was really cheap. They cost about $1200 which would be
about $8,000 today. A lot of people thought a scooter would save
them money! LOL

My experience with Ge Transistors was mostly 2N441 "door Knobs"
with 2N465 drivers. We made 1KW frequency changers for driving
aircraft equipment in a test lab.

I and my friends burned out a lot of those doorknob transistors and the
2N458As, too. We used to make DC-AC inverters that ran at over 400 Hz.
We used a Tek 541 or was it 531 'scope for a load because the power
transformer would handle those higher freqs. Took over 250W to run that
'scope. Later we used the inverter to power our mobile stereo amp.

Among other power and signal
equipment with Ge PNP simi-conductors predominant. You know
2N404, 2N1302,4,6 etc. Some systems used thousands of 2N404's and
2N1302's. With a cabinet as big as a coffin!

Sounds like it was military equipment.

 

[Roger Gt]

X-No-Archive: yes
"Watson A.Name - wrote
: > "Watson A.Name - wrote
: > : "Jim Thompson" wrote
: > : > "Tam/WB2TT" wrote
<snip>
: > The Renault was really cheap. They cost about $1200 which
would be
: > about $8,000 today. A lot of people thought a scooter would
save
: > them money! LOL
: >
: > My experience with Ge Transistors was mostly 2N441 "door
Knobs"
: > with 2N465 drivers. We made 1KW frequency changers for driving
: > aircraft equipment in a test lab.
:
: I and my friends burned out a lot of those doorknob transistors
and the
: 2N458As, too. We used to make DC-AC inverters that ran at over
400 Hz.
: We used a Tek 541 or was it 531 'scope for a load because the
power
: transformer would handle those higher freqs. Took over 250W to
run that
: 'scope. Later we used the inverter to power our mobile stereo
amp.

The FChangers were 60 hertz input (CPS back then) to 400 hertz
modified Sine out. Used a 40 Volts intermediate DC level. We had
to hold plus-minus 10 Hertz. Never heard of power being THAT
fussy, but some of the gear was motor driven, like DRUM memories.

: > Among other power and signal
: > equipment with Ge PNP simi-conductors predominant. You know
: > 2N404, 2N1302,4,6 etc. Some systems used thousands of 2N404's
and
: > 2N1302's. With a cabinet as big as a coffin!
:
: Sounds like it was military equipment.

Most of it... Some for NASA too. Range equipment and some that
had to run at -20 degrees C, to 45 Degrees C, cool area stuff on a
mountain top!

On the other hand the ADC's and Data Mux for the X15 was tiny by
comparison. Only about thirty cubic inches. (Its on display in
the Dayton Ohio Air and Space Museum if your ever in that area.)
The Rocket telemetry gear was also pretty small. For then!

Roger G

 

[Jim Thompson]

[snip]

IIRC my 1961 Dauphine cost me $1100.00, purchased at Luby Chevrolet in
Boston.

...Jim Thompson

 

[Richard Henry]

[snip]

IIRC my 1961 Dauphine cost me $1100.00, purchased at Luby Chevrolet in
Boston.

My high school French teacher (who else?) had a Dauphine. As a practical
joke, the school jocks picked it up and turned it 90° in its parking spot
one day.

 

[Jim Thompson]

The Renault was really cheap. They cost about $1200 which would be
about $8,000 today. A lot of people thought a scooter would save
them money! LOL

[snip]

IIRC my 1961 Dauphine cost me $1100.00, purchased at Luby Chevrolet in
Boston.

My high school French teacher (who else?) had a Dauphine. As a practical
joke, the school jocks picked it up and turned it 90° in its parking spot
one day.

Some Cambridge "urchins" (Win will appreciate the term) picked mine up
out of the street and placed it on the sidewalk end-to-end between two
trees :-(

With only inches to spare I jockeyed it back and forth for probably 20
minutes before I got it free.

...Jim Thompson

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

[snip]

: Sounds like it was military equipment.

Most of it... Some for NASA too. Range equipment and some that
had to run at -20 degrees C, to 45 Degrees C, cool area stuff on a
mountain top!

On the other hand the ADC's and Data Mux for the X15 was tiny by
comparison. Only about thirty cubic inches. (Its on display in
the Dayton Ohio Air and Space Museum if your ever in that area.)
The Rocket telemetry gear was also pretty small. For then!

Cool, rockets! I was a member of RRS back in the '60s when I was a kid;
had to go out to the desert and see the launches. http://www.rrs.org
Back then we couldn't figure out how to do all that instrumentation
stuff that's done today. Things have come a long way.

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

The Renault was really cheap. They cost about $1200 which would be
about $8,000 today. A lot of people thought a scooter would save
them money! LOL

[snip]

IIRC my 1961 Dauphine cost me $1100.00, purchased at Luby Chevrolet in
Boston.

My high school French teacher (who else?) had a Dauphine. As a practical
joke, the school jocks picked it up and turned it 90° in its parking spot
one day.

Seems like everyone did that in high school. In my case it was a
teacher's VW bug.

 

[N. Thornton]

Here is a link and a picture of the kit:
http://www.wimb.net/index.php?s=electr&page=1
It is step 4, someone gave one to me.
Note the 150 Ohm speaker.
Not very load, but usable.

Class A, 150 ohm LS load, and 100 ohm emitter resistor as well =
exceptionally inefficient.

Regards, NT

 

[Roger Gt]

"Watson A.Name - "Watt Sun, the Dark Remover""
:
:
: : [snip]
: > : Sounds like it was military equipment.
:
: > Most of it... Some for NASA too. Range equipment and some
that
: > had to run at -20 degrees C, to 45 Degrees C, cool area stuff
on a
: > mountain top!
:
: > On the other hand the ADC's and Data Mux for the X15 was tiny
by
: > comparison. Only about thirty cubic inches. (Its on display
in
: > the Dayton Ohio Air and Space Museum if your ever in that
area.)
: > The Rocket telemetry gear was also pretty small. For then!
:
: Cool, rockets! I was a member of RRS back in the '60s when I
was a kid;
: had to go out to the desert and see the launches.
http://www.rrs.org
: Back then we couldn't figure out how to do all that
instrumentation
: stuff that's done today. Things have come a long way.
:
Oh yes, the toys that the Homeland security people think are a
cover for terrorism! DUMB A$$es!

I only saw one launch at white sands, the top stage was an AEROBEE
I have no idea what the other two stages were. I was there to
supervise the installation of our telemetry gear in the AEROBEE
but they let me hang around for the launch. They said "two, one,
zero" and the assembly lifted off, seconds later it was out of
sight. But the telemetry came in just fine. I have no idea what
the mission was, or the result. Part of a upper atmosphere
analysis I was told. The third stage peaked at over seventy
miles. Like I said, only a toy!

 

[Rich Grise]

Seems like everyone did that in high school. In my case it was a
teacher's VW bug.

I've heard talk of going to a neighboring community and painting the
name of a third town on their water tower.

Cheers!
Rich

 

[Richard Henry]

On Sat, 19 Jun 2004 11:42:37 -0700, "Watson A.Name - \"Watt Sun, the



[snip]
The Renault was really cheap. They cost about $1200 which would be
about $8,000 today. A lot of people thought a scooter would save
them money! LOL

[snip]

IIRC my 1961 Dauphine cost me $1100.00, purchased at Luby Chevrolet in
Boston.

My high school French teacher (who else?) had a Dauphine. As a practical
joke, the school jocks picked it up and turned it 90° in its parking spot
one day.

Seems like everyone did that in high school. In my case it was a
teacher's VW bug.

I attended a college that had a very small female undergraduate population
(about 50/2500). Most of the single girls lived in an old mansion on the
college grounds in the midst of several male-only dormitories. One Saturday
night several young men (identities unknown to me) picked up a samll English
sports car (Austin?) and carried it up a half-flight of stairs onto the
mansion porch. The girls had the last laugh - they pushed the car in
through the double front doors and "hid" it in the grand hall.

 

[Richard Henry]

in message
I've heard talk of going to a neighboring community and painting the
name of a third town on their water tower.

The all-time champion:

http://www.museumofhoaxes.com/pranks/rosebowl.html

 

[Jim Thompson]

[snip]

The all-time champion:

http://www.museumofhoaxes.com/pranks/rosebowl.html

I prefer the MIT hack at a Harvard football game myself....

http://info.astrian.net/jargon/Hacker_Folklore/The_Meaning_of_Hack.html

...Jim Thompson

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

Class A, 150 ohm LS load, and 100 ohm emitter resistor as well =
exceptionally inefficient.

Regards, NT

When I go to the link above, I get

"If you see this text, your browser is not "standards-compliant".
You may update to a standard one, for example: Mozilla FireFox"

Well, silly me! I'm only using Mozilla 1.5!. Maybe I should upgrade??
Seriously, I think there's something else wrong.

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

Class A, 150 ohm LS load, and 100 ohm emitter resistor as well =
exceptionally inefficient.

Regards, NT

Schem shows two batteries in series. What's the supply voltage?? 3V?
Or are those 9V batteries?

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

"Watson A.Name - "Watt Sun, the Dark Remover""
:
:
: : [snip]
: > : Sounds like it was military equipment.
:
: > Most of it... Some for NASA too. Range equipment and some
that
: > had to run at -20 degrees C, to 45 Degrees C, cool area stuff
on a
: > mountain top!
:
: > On the other hand the ADC's and Data Mux for the X15 was tiny
by
: > comparison. Only about thirty cubic inches. (Its on display
in
: > the Dayton Ohio Air and Space Museum if your ever in that
area.)
: > The Rocket telemetry gear was also pretty small. For then!
:
: Cool, rockets! I was a member of RRS back in the '60s when I
was a kid;
: had to go out to the desert and see the launches.
http://www.rrs.org
: Back then we couldn't figure out how to do all that
instrumentation
: stuff that's done today. Things have come a long way.
:
Oh yes, the toys that the Homeland security people think are a
cover for terrorism! DUMB A$$es!

I only saw one launch at white sands, the top stage was an AEROBEE
I have no idea what the other two stages were. I was there to
supervise the installation of our telemetry gear in the AEROBEE
but they let me hang around for the launch. They said "two, one,
zero" and the assembly lifted off, seconds later it was out of
sight. But the telemetry came in just fine. I have no idea what
the mission was, or the result. Part of a upper atmosphere
analysis I was told. The third stage peaked at over seventy
miles. Like I said, only a toy!

That (poor quality) movie they show of the two stage 'Dart' on their
website said it went to 280 kFeet. That's 53 miles. Not bad for a toy.