Re: Tektronix 570 Vacuum Tube Curve Tracer on eBay

peter bunge

I had a University EE Summer Student who did not know how a tube worked so
I broke a 6SN7 and showed him the parts. He then said tubes were no longer
used so I asked him what he thought was in our 100kW RF amp that drove the
Superconducting Cyclotron, and how he would replace it with Solid State. I
then told him his theories MIGHT work but how would Solid State handle the
huge reflected power often sent back to the amplifier, and survive?
I'm not sure how I would test a 4CW200,000 (if I remember the 200kW water
cooled tube number correctly). The HV power supply was bigger than our

On Sun, Jan 5, 2020 at 4:01 PM Dennis Tillman W7PF <@Dennis_Tillman_W7pF>

Hi Richard,

It may seem that vacuum tubes are history but nothing could be further
from the truth. To my amazement I have sold almost 200 of my little VTCT
Adapter boards. That really surprised me. That gives people a way to avoid
paying $5,000 for a 570 Tube Tester. It still costs at least a few hundred
dollars with my adapter because you still need some kind of transistor
curve tracer and a tube tester.

There are many applications that use tubes these days. Vacuum tube
manufacturing never went away and now the Russians are producing a lot of
them. But there are many other companies also doing it. A top of the line
vacuum tube audio amplifier will set you back $100,000 and eventually the
push-pull output tubes will need balancing or replacing. Likewise, rock
guitarists all use tube amplifiers, not solid state. The sound of tube
guitar amplifiers is sweeter and the guitarist can create far more classic
rock sound effects with tube amps than with solid state amplifiers. Like
with the home audio amplifiers, a lot depends on the push-pull output tubes
being balanced. Having balanced output tubes is essential to getting the
most from your guitar amplifier.

Testing transmitter tubes is another application for a tube curve tracer.

Dennis Tillman W7PF

-----Original Message-----
From: Richard Solomon
Sent: Sunday, January 05, 2020 9:22 AM
Subject: Re: [TekScopes] Tektronix 570 Vacuum Tube Curve Tracer on eBay

Pardon me if this sounds like
Heresy, but what real world use
would have for one of these ?

I can see the "cool/nostalgia"
factor, but other than that, what
would one do with it ??

Thanks, Dick, W1KSZ

On Sun, Jan 5, 2020 at 8:32 AM Dave Daniel <kc0wjn@...> wrote:

I have been looking at sales of Tektronix 570s, mostly but not all on
ebay, for a long time now. All of then have had an asking price of
around $4k.


Sent from a small flat thingy

On Jan 5, 2020, at 09:45, Eric <ericsp@...> wrote:

I would love to have a 570 in the lab but not for that that is nuts.

On 1/5/2020 9:36 AM, Mlynch001 wrote:
On Sat, Jan 4, 2020 at 10:48 PM, Dan Cordova wrote:

For less than $200, I put together a Dennis Tillman VTCT board,
my Hickok Tube Tester to use with my Tektronix 575 curve tracer.
also made
the Daniel Schoo designed triode and pentode adapters for the
Tektronix 576
Curve Tracer at work.
I'm also not sure all my tubes and stereo gear are worth ~$4000
I KNOW my stereo gear is not worth that much! I have the stuff to
build Dennis Tillman's VTCT and I have a 576 as well. So even after I
buy a suitable tube tester, I am sure that all told I would have less
$1000 in the whole thing. It might not do what the 570 will do, but
likely 95% as much and still test solid state devices as well. You
would need to have a serious desire or even more serious need for this
thing in order to justify paying that price. From the description, it
sounds as though this thing is not quite ready to go as it is. The
elephant in the room is getting it shipped to ones location without it
being destroyed in the process. The seller does have a "Make an
Offer" option as well. This will be interesting to watch.

Dennis Tillman W7PF
TekScopes Moderator

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