On 6/22/2020 5:58 AM, William Donzelli via cctalk wrote:
Darn. "Worse for noise" probably means I won't find audio nirvana
trying these in any of my amps.
Most computer tubes are pretty bad for audio, even though there are
plenty of snake oil tube dealers that proclaim them as audio gold.
--
EIA codes were used for non-tube electronic parrots.
On Mon, 22 Jun 2020, Nigel Johnson via cctalk wrote:
An electronic parrot in the vacuum tube days? -- must have been very large!
E's not dead! Just slip a new valve in.
An electronic parrot in the vacuum tube days? -- must have been very large!
On 22/06/2020 07:56, William Donzelli via cctalk wrote:
Thanks! What is the secret decoder ring that tells you 188 means GE?
EIA manufacturer codes. These were often applied to private and house
branded labelled tubes.
> Darn. "Worse for noise" probably means I won't find audio nirvana
> trying these in any of my amps.
Most computer tubes are pretty bad for audio, even though there are
plenty of snake oil tube dealers that proclaim them as audio gold.
--
Will
>
> Thanks! What is the secret decoder ring that tells you 188 means GE?
EIA manufacturer codes. These were often applied to private and house
branded labelled tubes. Other numbers are 274 for RCA, 280 for
Raytheon, 158 for DuMont, and so forth.
EIA codes were used for non-tube electronic parrot
On Wed, 2020-06-17 at 13:24 -0400, William Donzelli via cctalk wrote:
> 5965 is a computer rated 12AV7 with better balanced cutoff
> characteristics, but generally worse for noise.
Darn. "Worse for noise" probably means I won't find audio nirvana
trying these in any of my amps. And there's a go
On Wed, 2020-06-17 at 11:27 -0400, William Donzelli wrote:
> They are indeed GEs! 188 is the clue.
>
Thanks! What is the secret decoder ring that tells you 188 means GE?
Not exactly on subject, but problems designing the IBM 604 Electronic
Calculating Punch due to the use of existing vacuum tube designs is discussed
in section 2.4 of:
Charles J. Bashe, Lyle R. Johnson, John H. Palmer, and Emerson W. Pugh
IBM’s Early Computers
The MIT Press, 1986
The book says
> Ah, good ol' 5965s.
>
> These were a higher-spec version of ... some really common tube which I
> no longer remember. The Bendix G-15 was wholly based on them.
5965 is a computer rated 12AV7 with better balanced cutoff
characteristics, but generally worse for noise.
About 15 percent of the tub
On Wed, Jun 17, 2020 at 05:14:11PM +, Mark Linimon via cctech wrote:
> These were a higher-spec version of ... some really common tube which I
> no longer remember.
And which was mentioned in the original post -- oops!
mcl
On Tue, Jun 16, 2020 at 07:58:14AM -0700, Guy N. via cctech wrote:
> the part number (5965 or 5963)
Ah, good ol' 5965s.
These were a higher-spec version of ... some really common tube which I
no longer remember. The Bendix G-15 was wholly based on them. I probably
have one or two around the hou
They are indeed GEs! 188 is the clue.
--
Will
On Wed, Jun 17, 2020 at 11:14 AM Guy N. via cctalk
wrote:
>
> On Tue, 2020-06-16 at 11:04 -0400, William Donzelli wrote:
> > > Good question. They have an IBM logo and "Made in USA", along with the
> > > part number (5965 or 5963) and a bunch of num
On Tue, 2020-06-16 at 11:04 -0400, William Donzelli wrote:
> > Good question. They have an IBM logo and "Made in USA", along with the
> > part number (5965 or 5963) and a bunch of numbers that might give a hint
> > as to manufacturer. Any suggestions on how to decode them?
>
> What are the numbe
GE did not make many tubes for IBM except for some made for SAGE devices.
--
Will
On Tue, Jun 16, 2020 at 11:38 AM Camiel Vanderhoeven via cctalk
wrote:
>
> Mosyt likely GE.
>
> "IBM did the final assembly, but more than 400 companies supplied parts and
> subassemblies for its computers, includ
Mosyt likely GE.
"IBM did the final assembly, but more than 400 companies supplied parts and
subassemblies for its computers, including GE for vacuum tubes and 3M for
magnetic tapes.”
(https://www.computerhistory.org/revolution/early-computer-companies/5/111)
> On Jun 16, 2020, at 4:58 PM, Guy
> Good question. They have an IBM logo and "Made in USA", along with the
> part number (5965 or 5963) and a bunch of numbers that might give a hint
> as to manufacturer. Any suggestions on how to decode them?
What are the numbers?
Details, man!
--
Will
On Mon, 2020-06-15 at 10:24 -0400, William Donzelli wrote:
> > While going through my assortment of old vacuum tubes looking for audio
> > treasures, I found a handful of IBM branded ones. Mostly 5965, but
> > there's one 5963 mixed in.
>
> Who made them?
Good question. They have an IBM logo an
> While going through my assortment of old vacuum tubes looking for audio
> treasures, I found a handful of IBM branded ones. Mostly 5965, but
> there's one 5963 mixed in.
Who made them?
--
Will
Hard to say, without the modules they came from.
As far as my (limited) understanding of vacuum tube logic goes, double triodes
were very common for implementing basic boolean logic functions. Therefore,
most IBM vacuum tube computers and data processing machines would have
hundreds/thousands
While going through my assortment of old vacuum tubes looking for audio
treasures, I found a handful of IBM branded ones. Mostly 5965, but
there's one 5963 mixed in.
These are dual triodes with the same pinout as common small-signal audio
tubes such as 12AX7/7025/ECC83, but characteristics closer
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