>
>Subject: Re: OT: Tube Audio
> From: Scott Stevens <chenmel at earthlink.net>
> Date: Thu, 20 Oct 2005 07:40:01 -0500
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On Thu, 20 Oct 2005 07:57:58 -0400
>Allison <ajp166 at bellatlantic.net> wrote:
>
>> >
>> >Subject: Re: OT: Tube Audio
>> > From: "Chuck Guzis" <cclist at sydex.com>
>> > Date: Wed, 19 Oct 2005 23:08:47 -0700
>> > To: cctalk at classiccmp.org
>> >
>> >On 10/19/2005 at 10:19 PM Zane H. Healy wrote:
>> >
>> >>OK, since there seem to be a fair amount of people into Tube audio,
>> >>or at least with a knowledge of it. Would someone care to explain
>> >>the following to someone that is used to an all in one unit such as a
>> >>Sony Receiver. What is the purpose of separate Amp and Pre-Amps. I
>> >>think I understand the whole phono pre-stage, but I've yet to find a
>> >>decent explanation of the rest, and I'm looking to switch to tubes
>> >>for playback of records (primarily Vinyl, but I'm also interested in
>> >>78's).
>> >
>> >Purely from memory, but I believe one generally used a separate pre-amp
>> >mostly due to hum issues. The power supply for the preamp could make use
>> >of lower plate voltages, better regulation and DC heater supplies.
>> >
>> >Or so I think I recall.
>> >
>> >Cheers,
>> >Chuck
>> >
>>
>> No. Gads, creating answers revisionistically. Rare back then was a preamp
>> with DC heaters. Besides without the oxygen free stabilized cables how
>> could you appreciate it. ;)
>>
>My Dynaco preamp is from the early 60's and has a filtered DC power supply section for the heater filaments.
>
I didn't say nonexistant, only rare. Dynaco was amoung the best then.
The alternate was a filiment that was balanced to ground to minimize
the amplitude of AC heater to cathode coupling, also only seen on
quality gear.
Allison
> (1600 bpi), and some report a few hundred records of 16384, then a few
> at a smaller number, then more at 16384, etc. I'd think there were
> some read problems, but the tape wasn't shoe-shining
Are the "smaller sized" records 80 bytes, and have tape marks
near them? If so, these are the ANSI tape labels for volume start/end
and saveset start/end.
Even though you mount VMS BACKUP tapes /FOREIGN on
a VMS system, they still have ANSI labels on them.
If there are truly damaged records then the redundancy blocks
(unless you turned them off) will help you.
Tim.
>
>Subject: Re: OT: Tube Audio
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Wed, 19 Oct 2005 23:08:47 -0700
> To: cctalk at classiccmp.org
>
>On 10/19/2005 at 10:19 PM Zane H. Healy wrote:
>
>>OK, since there seem to be a fair amount of people into Tube audio,
>>or at least with a knowledge of it. Would someone care to explain
>>the following to someone that is used to an all in one unit such as a
>>Sony Receiver. What is the purpose of separate Amp and Pre-Amps. I
>>think I understand the whole phono pre-stage, but I've yet to find a
>>decent explanation of the rest, and I'm looking to switch to tubes
>>for playback of records (primarily Vinyl, but I'm also interested in
>>78's).
>
>Purely from memory, but I believe one generally used a separate pre-amp
>mostly due to hum issues. The power supply for the preamp could make use
>of lower plate voltages, better regulation and DC heater supplies.
>
>Or so I think I recall.
>
>Cheers,
>Chuck
>
No. Gads, creating answers revisionistically. Rare back then was a preamp
with DC heaters. Besides without the oxygen free stabilized cables how
could you appreciate it. ;)
The same preamp could be used with different power amps. Also
Not all preamps were the same depending on the source used
(mag cart, moving coil or variable reluctance or even ceramic)
and the response curve requred. Many amps contained the required
preamp, some didn't. Generally the larger ones didn't due to size.
As the stereo system could have the preamps, volume and tone controlls
for user convenience and the power amp (the large, heavy and hot)
located elsewhere. Back in the 60s I knew a few people that were
into serious audio and the power amp was in the basement, it produced
too much heat, large and was ugly. Back then a good FM (maybe even stereo)
reciever was often seperate as well.
Component audio was that way.
Just like component computers.
Allison
On Oct 19 2005, 7:49, Joe Abbott wrote:
> Sooo... If anyone has a Cromemco SCC board with ROMs,
> please check them to see if they are the MCB-216 roms.
> There were two 2716 roms in sockets 0 and 1 containing
> a monitor program and 3k control basic. We need an
> image of these roms or a text hex/decimal/octal
> listing would suffice (anything machine or human
> readable as long as it's accurate and complete).
>
> Pete T. and Randy M. on the list were also looking for
> these.
Yes. I have an SCC but not with those ROMs, and my attempts to find
the MCB-216 ROMs have met with no more success than Joe's.
--
Pete Peter Turnbull
Network Manager
University of York
At 12:00 -0500 10/17/05, woodelf wrote:
>Are we tallking real gates as in TTL, or FPGA style design? Forth does
>have several advantages
>over say fortran since they removed the Sense Switch requirment of
>fortran.My worry is that you
>may not be able to high-level threshold logic and memory anymore for
>industral problems.
Either TTL, or in 20 years, whatever the then-current version
of FPGA or ASIC is. (To tell the truth, I had in mind re-creating the
Harris RTX2010, but that's just me.) The point is, creating from
scratch and then verifying a system (hardware, OS, software) to run
FORTH reliably would be far easier than the same task for FORTRAN or
JAVA, and in 20 years, that may be the path you'd choose to take.
I am depressed at how difficult it has become for any one
person to really understand either all of the hardware or all of the
software (let alone both) in any commodity system, whether controller
or desktop. Two more decades in that direction, and who'll know
*what* is "under the hood"? Viruses, mal-ware in distribution CD's,
Pentium floating-point multiply bugs, cache sync errors, my personal
favorite - a compiler that forgot to save the contents of its
floating-point registers when it got an interrupt in the middle of a
calculation - and so on .... That stuff will all affect "emulators"
too. So if your application is mission-critical, you may want/need to
re-build the platform system from scratch. Better a simple set of
system requirements (a la FORTH) if that's where you end up going.
--
- Mark
210-522-6025, temporary cell 240-375-2995
On Oct 17 2005, 10:50, Bert Thomas wrote:
> Doc Shipley wrote:
> > Check this out:
> >
> > http://venhaus1.com/airsine.html
> >
> > US$700 power cable. I'm not kidding.
>
> What kind of people believe in this crap?
> Do they replace the wiring in their house as well to prevent
> micro-movements of the wires?
> And after that the cable that delivers electricity to their house?
> Or are they generating their own "clean" current with special
generators
> wounded with golden wires?
> Hmmm, with some fantansy I can create a whole new market.
One of my cow orkers, Marc, has pointed out that some of it's been done
before:
http://www.belt.demon.co.uk/
For those who don't want to wade through the drivel, Marc sums it up
thus:
"Stuff like ensuring all books in the listening room have to
have an odd number of pages, sticking bits of foil here there
and everywhere...the web site reads like some weird cult, but
he made a lot of money from it, so who's the fool ??"
--
Pete Peter Turnbull
Network Manager
University of York
>
>Subject: Re: Computer speedometers
> From: "John Allain" <allain at panix.com>
> Date: Wed, 19 Oct 2005 20:29:41 -0400
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>Some IBM 370's had a big galvanometer on the front,
>EG the '168 had one even with the massive CRT
>up there on the panel.
>(photo courtesy the corestore)
> http://www.corestore.org/370168-1.jpg
>
>AIX / RS6000 had a nice set of onscreen meters.
>
>Old fantasy: working Apollo CM control panel with all
> the lights, switches and barberpoles.
>
>John A.
Check out www.spaceref.com/exploration/apollo/acgreplica/
to build your own block 1 AGC.
Allison
Hey everyone!
I need some help. I have an RL02 disk drive that sat in a warehouse for
awhile, and somehow it got spiders (and their webs) in it, and the previous
owner contaminated the drive by shipping it exposed in foam and the foam got
all over the inside of the drive. What's the best method to disassemble and
clean an RL02 disk drive in this situation? There's none in the drive
platter area, but it's all down in the cavity below it.
Thanks
Julian
I live near Newark, Delaware and I am interested in acquiring a Computer
Data Systems "Versatile 2" computer. This company was based in Newark,
Delaware USA in 1977. I know practically nothing about this company,
and the Delaware Historical Society has little more than their old
address. As one of the few collectors in the area, I hope to "bring
one of these systems home" for a proper preservation.
The Versatile 2 was a 1977 Z80-based S-100 system with integrated
monitor and keyboard. See:
http://www.old-computers.com/museum/computer.asp?st=1&c=345
I would also be interested in software, CDS disk drive, manuals,
documentation, ads, and whatever.
Please contact me off list if you can help. I am willing to pay $$.
Bill D
-- E N D --
