Re: IBM vacuum tubes

2020-06-22 Thread ben via cctalk
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. --

Re: IBM vacuum tubes

2020-06-22 Thread Fred Cisin via cctalk
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.

Re: IBM vacuum tubes

2020-06-22 Thread Nigel Johnson via cctalk
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

Re: IBM vacuum tubes

2020-06-22 Thread William Donzelli via cctalk
> 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

Re: IBM vacuum tubes

2020-06-22 Thread William Donzelli via cctalk
> > 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

Re: IBM vacuum tubes

2020-06-22 Thread Guy N. via cctalk
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

Re: IBM vacuum tubes

2020-06-22 Thread Guy N. via cctalk
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?