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as much as I hate to say it...this is the mentality of most people
today...it breaks/does not work correctly toss it and go by a new one
and old stuff is no good.....what a loss...poor 465......
thank goodness this mentality does not apply to this wonderful group!
lets keep the good stuff running!
搁别苍é别

On 2019-08-31 3:15 p.m., Bob Albert via Groups.Io wrote:

The reverse Midas touch, apparently.
Geez, if something doesn't work and can't be fixed, it certainly offers

a wealth of recyclable parts.

Bob
On Saturday, August 31, 2019, 03:01:42 PM PDT, Raymond Domp Frank <

hewpatek@...> wrote:

What follows is a longish and sad story.
A few days ago, I was contacted by someone who said he was looking for a

good quality analog 'scope.

Without asking many questions, I showed him one of my 465's and he liked

it. He expressed some concern as to the reliability of these very old
instruments (I think this sample was from 1976/77). I told him that these
old 'scopes were still "more usable than unreliable", that some parts did
tend to fail from old age, especially the dipped tantalum caps but that
diagnosis and repair was straightforward, that I would take care of repair
for some time in the future for free and that I had an ample spare
components supply of all sorts should they be needed.

He was going to use the 'scope mainly for adjusting radio receivers and

was looking forward to the high vertical sensitivity, especially when using
a 1:1 probe. This should have been a warning for me but I limited myself to
explaining why the use of passive 1:1 probes cannot be recommended for some
of his intended use (450 kHz and 10.7 MHz IF) and giving him an example of
the math.

We agreed on a price and he left, happy with his newly acquired classic,

or so I thought.

After a few days, he contacted me, asking for two knobs (A and B trigger

level), since apparently parts had broken off. I told him that I'd send
replacements for free.

Before I could send them, he contacted me, saying that the replacement

knobs were no longer needed since the 'scope had broken down: no beam, no
graticule illumination, no fan sound, and that he had concluded that his
'scope obviously was a total loss. He was sorry to tell me the bad news but
he had very much appreciated my explanations and service and he definitely
wouldn't want any money back. When I offered to repair the 'scope for free,
he added that that wouldn't be possible, since it was now in an underground
dumpster, inaccessible to him. He once again blamed himself for making the
mistake of buying such an old piece of equipment and we "parted as friends".

I still feel for the poor lonely instrument enveloped in darkness...

Raymond







.

From looking at some of the other threads I thought i’d Offer up a 485 here before we strip it

Contact me off list at s.hanselman@...

The reverse Midas touch, apparently.
Geez, if something doesn't work and can't be fixed, it certainly offers a wealth of recyclable parts.
Bob
On Saturday, August 31, 2019, 03:01:42 PM PDT, Raymond Domp Frank <hewpatek@...> wrote:
What follows is a longish and sad story.
A few days ago, I was contacted by someone who said he was looking for a good quality analog 'scope.
Without asking many questions, I showed him one of my 465's and he liked it. He expressed some concern as to the reliability of these very old instruments (I think this sample was from 1976/77). I told him that these old 'scopes were still "more usable than unreliable", that some parts did tend to fail from old age, especially the dipped tantalum caps but that diagnosis and repair was straightforward, that I would take care of repair for some time in the future for free and that I had an ample spare components supply of all sorts should they be needed.
He was going to use the 'scope mainly for adjusting radio receivers and was looking forward to the high vertical sensitivity, especially when using a 1:1 probe. This should have been a warning for me but I limited myself to explaining why the use of passive 1:1 probes cannot be recommended for some of his intended use (450 kHz and 10.7 MHz IF) and giving him an example of the math.
We agreed on a price and he left, happy with his newly acquired classic, or so I thought.
After a few days, he contacted me, asking for two knobs (A and B trigger level), since apparently parts had broken off. I told him that I'd send replacements for free.
Before I could send them, he contacted me, saying that the replacement knobs were no longer needed since the 'scope had broken down: no beam, no graticule illumination, no fan sound, and that he had concluded that his 'scope obviously was a total loss. He was sorry to tell me the bad news but he had very much appreciated my explanations and service and he definitely wouldn't want any money back. When I offered to repair the 'scope for free, he added that that wouldn't be possible, since it was now in an underground dumpster, inaccessible to him. He once again blamed himself for making the mistake of buying such an old piece of equipment and we "parted as friends".
I still feel for the poor lonely instrument enveloped in darkness...

Raymond





.

Hello all curious about NVRAMs data.

Do the 2456B NVRAM images differ for various options eg 06, 09 GPIB, WR, CTT?

Or for different serial number ranges?

Or perhaps NVRAM images are same for all scopes of a type?

In other words are the options and serial range pre- stored in the NVRAM?

Many thanks


Jon

Hi all,

I am looking to the group for suggestions/recommendations as I am in the market for a decent DSO. I currently have a TLS216, in fine condition, without probes (therefore not useful at all). Is this unit worth holding onto and gathering up probes for this unit or would it make more sense to move on to another unit with conventional BNC connectors, for ease?

Thank you,

CJ

Phil

The replacement for the 5AR4 is a couple of solid sates diodes. You can simply solder them to the tube? socket underneath the chassis and leave the old dead 5AR4 plugged in for appearances ....... 8^).

It is too bad we cant get our loved ones taxidermy'd? ...stand them up next to the xmas tree on a roll around base with a drink in their hand

Dave
manuals@...

On 8/31/2019 5:45 PM, Phillip Potter wrote:

Hi Chuck,

While I was reading your comment to Jamie, I note with interest your suggestion that a 5AR4 is of little demand.? This tube number jogged my memory, and I found it easily in the Service Manual for my HP 200CD Signal Generator, where it is employed as a rectifier tube... I'm hoping that you're right about that, because I could use one for a spare. ;)

Phil

On 8/30/2019 6:45 PM, ChuckA wrote:

BTW a workable replacement for the 5AR4 is a 5V4 again a TV damper tube and very little demand outside of the TV collector community.

Hi Chuck,

While I was reading your comment to Jamie, I note with interest your suggestion that a 5AR4 is of little demand.? This tube number jogged my memory, and I found it easily in the Service Manual for my HP 200CD Signal Generator, where it is employed as a rectifier tube... I'm hoping that you're right about that, because I could use one for a spare. ;)

Phil

On 8/30/2019 6:45 PM, ChuckA wrote:

BTW a workable replacement for the 5AR4 is a 5V4 again a TV damper tube and very little demand outside of the TV collector community.

...stand them up next to the xmas tree on a roll around base with a drink in their hand

On Aug 31, 2019, at 15:08, Richard Knoppow <dickburk@...> wrote:

I vaguely remember using a 5AR4 as the rectifier for a tube amp I built maybe sixty years ago. It seems to me, without looking it up, it has a separate cathode and probably lower voltage drop than the filamentary cathode types. If some audiophile wants better B+ regulation silicon diodes are the way to go but a regulated power supply is better. OTOH, the DWP (power in Los Angeles) refused to install a solid silver pole pig here so I have given up on improving the supplies of my audio amplifiers. I wonder if you used a local generator for audio of the Fools would argue about the brand of gasoline (or diesel fuel) used to run it.

On 8/31/2019 2:45 PM, Phillip Potter wrote:
Hi Chuck,
While I was reading your comment to Jamie, I note with interest your suggestion that a 5AR4 is of little demand.? This tube number jogged my memory, and I found it easily in the Service Manual for my HP 200CD Signal Generator, where it is employed as a rectifier tube... I'm hoping that you're right about that, because I could use one for a spare. ;)
Phil

On 8/30/2019 6:45 PM, ChuckA wrote:
BTW a workable replacement for the 5AR4 is a 5V4 again a TV damper tube and very little demand outside of the TV collector community.

--
Richard Knoppow
dickburk@...
WB6KBL