Author Topic: Do you have any test equipment in your lab that uses vacuum tubes?  (Read 3525 times)

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Offline Martin.M

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #75 on: September 15, 2019, 07:41:44 pm »
as audiophools gut them for their dual triodes and discard the carcasses.  That really burns me up!

they are waiting for the next youtube video:  "we build a scope using a Marantz Tuner"  :palm:
 
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Offline Bill158

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #76 on: September 15, 2019, 08:08:47 pm »
Does a FLUKE 5215A power amp count?  This is used with the 5200A AC Calibrator to generate up to  1000 Volts RMS, up to 100 KHz.  Uses 4 ea. 4X150A transmitting tubes in the output.  This thing is a real "widow maker" if you are not careful.  It will also smoke any DVM that isn't rated at 1000 Volts AC at any frequency.  You need to check the specs on the meter you are trying to calibrate before applying the AC voltage.  It also doubles as a swell lab heater all year around.
Bill
 

Offline Michael Lloyd

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #77 on: September 15, 2019, 08:56:39 pm »
I've got a few. Some I have duplicates. Some are a little rough but they work. All are not "on" the bench but I can use them as needed or desired. I have a very large Tektronix o-scope that's full of tubes but I haven't done anything with it, yet.

Some stuff I don't have photos of. Like: An Eico-147A signal generator, Eico 315 signal generator, Eico 950 capacitor tester, and the queen of my bench - an Eico 249 VTVM. It shows up in at least one of the photos below

Tektronix 422 in black























Knight 83Y135 Signal Tracer. No photo at the moment

I restored this old oscilloscope. It was an adventure

After


Before (the inside looked worse)
















These two beaters work now:

Technically this isn't usable because it's not restored yet. I don't have a model number or schematic but I haven't looked very hard for it either


 
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Offline james_s

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #78 on: September 16, 2019, 05:29:40 am »
I'd forgotten, I do have a Heathkit IP-32 power supply that has tubes in it. It's not something I use often, but on occasions where I need a relatively high regulated DC voltage there's nothing else I have that can deliver.
 

Offline bob91343

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #79 on: September 21, 2019, 02:01:52 am »
Those are wonderful pictures!  I wish I had the patience to photograph some of my gear.  I have plenty of it that uses tubes.

In fact, yesterday I managed to get working again my venerable HP 428A clip-on dc millliammeter.  Nice to have it again.
 
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Offline mmagin

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #80 on: September 21, 2019, 04:19:05 am »
Technically this isn't usable because it's not restored yet. I don't have a model number or schematic but I haven't looked very hard for it either



That is the military, possibly second-source (non-HP) version of the HP 410b. 
 
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Offline Martin.M

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #81 on: September 21, 2019, 05:07:45 am »
VTVM:

Sennheiser RV55 is a AC mVM
Grundig RV3 is a VTVM with a warm probe for HF

RV55 is a wonder about the s/n what it have in the < 1mV range, made with tubes. Here we find the experience of microphones technology (under-heated triode system)

amazing: Sennheiser is a sponsor company at the Makerfaire Hannover, there is a friendship bec. I run there always any glowing history of them..
This year I got a very lot of technical manuals from them, this books are now avaiable for all who do restorations. Also they have given me a RV54 made by LABOR W (Laboratories Wennebostel, that is the rather old name of them ! )





 :)
« Last Edit: September 21, 2019, 05:27:29 am by Martin.M »
 

Offline ferdieCX

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #82 on: September 23, 2019, 12:41:47 am »
VTVM:

Sennheiser RV55 is a AC mVM

(Attachment Link)


The BNC T in the picture looks like the ones that came with the VAXstations.
Is that correct ?  :)
« Last Edit: September 23, 2019, 12:48:19 am by ferdieCX »
 

Offline Martin.M

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #83 on: September 24, 2019, 04:27:29 pm »
I really don`t know that. Have saved the life from an old SGI, it was not possible to put it here in the room.
It may be enough, no VAX here

Martin
 
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Offline Martin.M

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #84 on: September 26, 2019, 03:10:48 pm »
lo-Ohm-Meter, 4wires testing. Full glowing  :)

< 1/3/10/30/100/300 Ohms full scale. This Oldie can test ESR at 10kHz sine also.
It is possible this is the last one, it was made for internal use in the own manufacturings, by Philips NL.
Picture: testing a 10 ohm







 :)
« Last Edit: September 26, 2019, 03:18:15 pm by Martin.M »
 
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Offline 001

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #85 on: September 26, 2019, 08:04:15 pm »
I see a lot of tube power supplies in the tread

What way You are using tube PS for? I mean in 2019

I remember what all similar PS have high voltage spikes if You turn it off and no current limit anyway  :-//

« Last Edit: September 26, 2019, 08:06:51 pm by 001 »
 

Offline vk6zgo

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #86 on: September 27, 2019, 12:51:16 am »
I see a lot of tube power supplies in the tread

What way You are using tube PS for? I mean in 2019

I remember what all similar PS have high voltage spikes if You turn it off and no current limit anyway  :-//

If you are using them with tubes, such devices have a high degree of immunity to high voltage transients, as do many high voltage solid state devices, which are often used with relatively simple supplies.

Many quite advanced tube power supplies exist which do have current limiting.
Turn off of tube supplies can mean many things, such as turning the whole thing off, where, as the heaters are still hot, will result in a graceful drop in voltage to zero as they cool down.

None of the tube power supplies I remember using had a separate switch for applying already present voltage to the output terminals.
They were pretty much "turn the thing on from scratch".

Transmitter power supplies are an exception, where they sometimes applied HT progressively to different sections of the equipment.

The only comment I have seen regarding "voltage spikes" is where people are using tube based supplies to provide solid state type voltage levels.
This is a long way from the original intended use of these power supplies.
 

Offline Michael Lloyd

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #87 on: September 27, 2019, 01:11:23 am »
Mine gets used in vintage Ham radio circuits (tube).
 

Offline SLJ

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #88 on: September 27, 2019, 02:29:21 am »
Half my bench is vacuum tube equipment.


That's mostly what I work on.
« Last Edit: September 27, 2019, 02:31:22 am by SLJ »
 
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Offline TheUnnamedNewbie

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #89 on: September 27, 2019, 06:47:21 am »
While technically not vacuum tubes, I do have a multimeter that still uses nixies (keithley 164). Does that count?
The best part about magic is when it stops being magic and becomes science instead
 

Offline 001

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #90 on: September 27, 2019, 01:13:32 pm »

This is a long way from the original intended use of these power supplies.

Ok
What is You favorite tube power supply?
 

Offline vk6zgo

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #91 on: September 28, 2019, 12:59:14 am »

This is a long way from the original intended use of these power supplies.

Ok
What is You favorite tube power supply?

Good comeback!

I don't have one
Standalone tube power supplies were never very common.

You might have found some in University or Tech College Labs, or at equipment Manufacturers.
From memory, there was one at the 6WF transmiier site where I worked many moons ago, & that's about the only one I remember outside Tech College.

Most tube supplies were part of a complete piece of equipment, & were fairly straightforward designs, so the requirement for such a supply "on the bench" was fairly rare.

PS:-The above may sound as if I am contradicting my earlier posting, but there were many designs around for standalone supplies in books, magazines, etc, although it was unusual to see one "in the flesh".
« Last Edit: September 28, 2019, 01:23:01 am by vk6zgo »
 

Offline 0culus

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #92 on: September 28, 2019, 01:28:15 am »
I seem to remember a Mr. Carlson's Lab episode where he demonstrates a rather beefy tube supply he uses on his bench.
 

Offline bob91343

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #93 on: September 28, 2019, 06:41:01 am »
I have one of those beefy power supplies.  I never have used it.
 

Offline 001

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #94 on: September 28, 2019, 11:41:12 am »
I have one of those beefy power supplies.  I never have used it.

So what the reason to own it?  :-//
 

Offline TimFox

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #95 on: September 28, 2019, 01:57:20 pm »
Because it's a free country?
 

Offline schmitt trigger

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #96 on: September 28, 2019, 07:41:52 pm »
Although I don't have the joy of owning a vacuum tube based test equipment, I do have a vacuum tube tester.
That must count as something.
 

Offline bob91343

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #97 on: September 28, 2019, 11:55:01 pm »
The reason to own it is that nobody wants to buy it.  I don't want to throw it away.  It works great.  I have owned it for about 40 years.  Every couple of years I switch it on to see if it still works.  The only problems it has are that one of the meters has a crack in the glass and one of the toggle switches gets intermittent from lack of use.

It's nice, a big job in a rack panel, two main outputs 0-300V and 0-500V which can be put in series for 0-800 V.  Also filament supply, 6.3V.  One supply uses a variac.  Perfect for bench testing of a 100W transmitter or a big tube type audio amplifier, servomechanism, or the like.  They are closely regulated outputs and the unit is top quality, Dressen-Barnes.

I am saving it for swap I guess.  What would you do with it?
 
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Offline med6753

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #98 on: September 29, 2019, 01:24:19 am »
Nothing like encouraging destruction of vintage equipment by audio phools. This clown includes in his ad "got Bulge boy tubes in it"

https://www.ebay.com/itm/Vintage-Working-Tektronix-561B-Oscilliscope-2A60-AMPLIFIER-2B67-time-tube-type/113715031978?hash=item1a79f1afaa:g:45QAAOSwJvVcN8zE
An old gray beard with an attitude.
 
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Offline 0culus

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Re: Do you have any test equipment in your lab that uses vacuum tubes?
« Reply #99 on: September 29, 2019, 01:26:20 am »
I'm super tempted to buy it just to prevent that. But this clown probably wouldn't pack it worth a shite.  :--
 
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