35c5
u64...@uic.edu
should be getting out of it.
-Noah the nerd-
--
Mary Pellettieri
University of Illinois at Chicago
E-Mail: u64...@uic.edu
Scott Dorsey
>Heard of it? Its' a small power tube. I was woundering how much output I
>should be getting out of it.
Not much... If your tube handbook doesn't have the 35C5 in it, look for
the 50C5. These were very common output devices in cheap table radios
of the fifties. (Single ended too, no less).
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
Dans Cockatoo Ranch
>Heard of it? Its' a small power tube. I was woundering how much output I
>should be getting out of it.
The 35C5 is a small 7 pin beam power amp. It was used extensively in
table radios. It has similar characteristics to the 35L6 which was also
common in six tube table radios. As a class A amp, which is the most
common application in small receivers, the maximum signal power output
is rated at 1.5 watts and a total harmonic distortion of 10%.
V
Daniel Schoo (o o)
Electronics Design Engineer ( V )
Fermilab, Batavia, Illinois, USA .......m.m......Dan's Cockatoo Ranch
vvv
Donald E. Turner
>
>Heard of it? Its' a small power tube. I was woundering how much output I
>should be getting out of it.
>
Mary: This is a tiny beam power tube intended for use in the "all
american five" superhetrodine recievers of the 50's. It has a 35 volt
filament intended to be one of five tubes of whos filament voltages added
up to 115 volts. These cheap radios had NO power transformer, so every
voltage was derrived from RAW line voltage. This tube had some older
brothers of the octal variety, the 50L6 for intence.
The bottom line is, unless you have one of these sets that needs a 35C5,
it ain't worth squat. Sorry to murder your dreams......Don Turner
Don Borowski
: In article <u64046.9...@uic.edu>, u64...@uic.edu says...
Minor correction. The 35C5 was used in 6-tube radios. The 50C5 was used
in 5-tube radios. There are a few exceptions, however.
Donald Borowski WA6OMI Hewlett-Packard, Spokane Division
"Angels are able to fly because they take themselves so lightly."
-G.K. Chesterton
Robert Casey
>Donald E. Turner (turn...@ccnet.com) wrote:
>: In article <u64046.9...@uic.edu>, u64...@uic.edu says...
>: >
>: >Heard of it? Its' a small power tube. I was woundering how much output I
>: >should be getting out of it.
>: >
>: american five" superhetrodine recievers of the 50's. It has a 35 volt
>: filament intended to be one of five tubes of whos filament voltages added
>: up to 115 volts. These cheap radios had NO power transformer, so every
>: voltage was derrived from RAW line voltage. This tube had some older
>: brothers of the octal variety, the 50L6 for intence.
>:
>: The bottom line is, unless you have one of these sets that needs a 35C5,
>: it ain't worth squat. Sorry to murder your dreams......Don Turner
>
>Minor correction. The 35C5 was used in 6-tube radios. The 50C5 was used
>in 5-tube radios. There are a few exceptions, however.
>
rec.antique.radio+phono It's usually used as a single ended class A
amp to generate about a watt of audio.
Charles Lasner
Robert Casey <wa2...@netcom.com> wrote:
>In article <DDq68...@hpcvsnz.cv.hp.com> boro...@spk.hp.com (Don Borowski) writes:
>>Donald E. Turner (turn...@ccnet.com) wrote:
>>: In article <u64046.9...@uic.edu>, u64...@uic.edu says...
>>: >
>>: >Heard of it? Its' a small power tube. I was woundering how much output I
>>: >should be getting out of it.
>>: >
>>: Mary: This is a tiny beam power tube intended for use in the "all
>>: american five" superhetrodine recievers of the 50's. It has a 35 volt
>>: filament intended to be one of five tubes of whos filament voltages added
>>: up to 115 volts. These cheap radios had NO power transformer, so every
>>: voltage was derrived from RAW line voltage. This tube had some older
>>: brothers of the octal variety, the 50L6 for intence.
>>:
>>: The bottom line is, unless you have one of these sets that needs a 35C5,
>>: it ain't worth squat. Sorry to murder your dreams......Don Turner
>>
>>Minor correction. The 35C5 was used in 6-tube radios. The 50C5 was used
>>in 5-tube radios. There are a few exceptions, however.
The generic topic is the use of series-string filaments to avoid filament
(heater) transformers altogether.
The 50C5 (and the earlier) 50L6 where the classic output "all american
five" tubes. Typically, the 35V was the rectifier and came first in the
string to act as a "fuse". (35W4?) (35Z5?)
I wish to relate to slightly unusual cases:
1) There was a 117L6 that could go it alone, but I believe I once
found an 80L6. It was used in series with a phonograph motor! The
crystal cartridge had enough voltage to drive the grid directly off of a
pot, etc.
BTW, the xL6 analogy doesn't completely hold up, since apparently all of
the xl6's past 6 (12) are roughly the same while the 6L6 is amuch higher
power tube. Also there are 25L6's. They were used by IBM inside of 026
keypunches as drivers (six in a row for the filaments). (I think the
12L6 is also low power?)
And of course, 6L6 is itself a non-monolith, since there is 6L6 (metal),
6L6G, GA, and GB where some are pear-shaped and some cylindrical, and all
different dissipation ratings, etc.
Some early steroe phonos did the same thing, such as 35C5 (two) in series
with 12AX7.
2) The standard miniature tube version of all-american-5 used 12V
tubes and a 150 mA series string with the bulk across the 50 and 35 tubes.
I once came across an odd set of tubes that apparently were only made by
Sylvania (and not listed in the then-current RCA manuals). Apparently
they were a placeable-as-a-set of tubes where the 12V became 18V and thus
the bulk was smaller for the rectifier and output tube. (Can't remember
any numbers except of course that the signal tubes all started with 18.)
The problem was that one of the 18V jobs was blown. I just took an
entire set from a standard AA5 radio and mass substituted and it worked fine.
Of course this made the radio run hotter (150 mA instead of 100 mA heater
current in the string), but I wonder why these never caught on...
And then there's the weird DC string: The battery portables (octal and
miniature) that used 1.5 and 3V DC direct filamnt tubes in a series
string off an "A" battery, or if plugged into the wall, used a rectifier
that was a 117V filament job. The filaments were in the ground-side of
the power supply so they used up the last 12V of the plate voltage. Some
of them had a ballast resistor because the plate current wasn't enough to
heat them up. It was generally a metal-cased flat object that looked
like a razor knife riveted onto the chassis for heat-sink purposes, etc.
A problem with those tubes is that you dare not change them with the
power on; it guarantees one of them blows (not generally the one you are
putting in!). Also, it was possible to see the dull glow of these
filamants but only in the dark, etc.
And a final variant subject: 12V only tubes for car radios: A germanium
PNP output transistor driven off a driver transformer with an alpha
cutoff of 3 KHz (!) (telephone quality audio in a car even if the
speakers are fine :-)). All lower power and signal handling done by
tubes with 12V heaters (not filaments; want lotsa hot electrons!) that
use extra accelerator grids (essentially a signal-level beam-power
pentode) so that the plate voltage is 12V total!
And a final quiz:
Name a product made in the last 50 years commercially that rectifies AC
-> DC current that does *not* use a tube at all. (The following answers
are already ruled out: any form of semi-conductor rectifier, vacuum or
gas-filed tubes, motor-generators that use AC motors to turn DC
generators, etc.)
The item in question is small, plugs into a socket (like a tube), and was
commercially sold, and incidentally, was used in some military gear.
Hint: the application could be to create DC voltages/currents suitable
for use as plate voltage power for associated audio power tubes, etc.
The first one to respond and solve the quiz receives absolutely free a
reward for negative resistance using a type 27A tetrode (but keep your
secondary emissions to yourself! :-).)
cjl (batteries included)
Fred Gilham
Charles Lasner writes:
----------------------------------------
And a final quiz:
Name a product made in the last 50 years commercially that rectifies AC
-> DC current that does *not* use a tube at all. (The following answers
are already ruled out: any form of semi-conductor rectifier, vacuum or
gas-filed tubes, motor-generators that use AC motors to turn DC
generators, etc.)
The item in question is small, plugs into a socket (like a tube), and was
commercially sold, and incidentally, was used in some military gear.
Hint: the application could be to create DC voltages/currents suitable
for use as plate voltage power for associated audio power tubes, etc.
The first one to respond and solve the quiz receives absolutely free a
reward for negative resistance using a type 27A tetrode (but keep your
secondary emissions to yourself! :-).)
----------------------------------------
I think you're talking about a vibrator. I thought it actually
switched DC into AC (i.e. acted as an interruptor), which was run
through a transformer. The current then went back into the vibrator
where it was switched back into DC. Kind of a de-interruptor. But
I'm not sure about the details.
--
Fred Gilham gil...@csl.sri.com
King Christ, this world is all aleak, / And life preservers there are none,
And waves that only He may walk / Who dared to call Himself a man.
-- e. e. cummings, from Jehovah Buried, Satan Dead
Charles Lasner
Fred Gilham <gil...@lily.csl.sri.com> wrote:
>
>I think you're talking about a vibrator. I thought it actually
>switched DC into AC (i.e. acted as an interruptor), which was run
>through a transformer. The current then went back into the vibrator
>where it was switched back into DC. Kind of a de-interruptor. But
>I'm not sure about the details.
Correct. Specifically a so-called "synchronous" vibrator. The asynch
type is used to make AC for a stup-up transformer thence a rectifier is
used more conventionally (often a cold-cathiode type). The synch type
can route the pulses to the approriate output terminals to produce a
dirty DC, etc.
cjl
Martin Ackroyd
: Name a product made in the last 50 years commercially that rectifies AC
: -> DC current that does *not* use a tube at all. (The following answers
: are already ruled out: any form of semi-conductor rectifier, vacuum or
: gas-filed tubes, motor-generators that use AC motors to turn DC
: generators, etc.)
A vibrator?
--
Martin A | Pending the Cadillac, my other car is a Schwinn Corvette
-----------------------------------------------------------------------------
Charles Lasner
Martin Ackroyd <mar...@ghoul.bri.hp.com> wrote:
>Charles Lasner (las...@sunSITE.unc.edu) wrote:
>
>: Name a product made in the last 50 years commercially that rectifies AC
>: are already ruled out: any form of semi-conductor rectifier, vacuum or
>: gas-filed tubes, motor-generators that use AC motors to turn DC
>: generators, etc.)
>
>
Actually, a synchronous vibrator where extra contacts steer the
transformer secondary polarity accordingly, etc. Dirty output, but it's DC!
But it does eliminate a tube rectifier, and you did need the vibrtor
real-estate anyway!
The usage gave way when 0Z4 and similar cold-cathode gas-filled
rectifiers became widely available. They are quite small considering
what they do, etc.
BTW, anyone remember the whole collection of lock-in tubes for car radios
that were this set? I believe they were referred to as Loktals? (Locking
Octal tubes?) They had thinner pins with a larger center keyed pin that
had a lock-over region and a socket to match, etc. (I assume there's a
cold-cathod Loktal and a more conventional Octal similar functioning
tube, etc.)
cjl