Re: 5xx 'Scopes


EVERY Tek curve tracer, except for the limited plugin versions (7CT1N and 5CT1N) have two "sockets" to do A/B comparisons. This includes the 570 (vacuum tube curve tracer), 575, 576, 577, and 370. The 576 and the 577 have similar basic capabilities such as their maximum voltage (1,600V at 100mA, and 1,500V at 200mA respectively), but differ significantly in other ways.

The 576 has an optional 176 high current "front porch" capable of testing power transistors. The 576 has readouts (not on-screen) which assist casual users in avoiding mistakes when making basic device measurements.

The 577 comes in a non-storage (577-D2) and storage 577-(D1) CRT version. It has an optional 176 "front porch" which can test single, dual, or quad OpAmps, SCRs, 3 Terminal Positive and Negative Voltage Regulators.

Both the 576 and the 577 were designed to make the majority of semiconductor measurements that any circuit designer would be interested in quantifying. I once asked Deane Kidd, when I was in his lab, which he recommended, 576 or 577. His answer was definitive: the 577 hands down. So that is what I found to replace my 575 10 years ago. I have had both the 577-D2 and 577-D1 over the years since and there is no question that the 577-D1 (storage) version has more capabilities although the storage is tricky to adjust and is sometimes annoying.

I am now fortunate to own both a 576 and a 577 and all the optional "front porches" so I can test just about anything.

Sean: I believe you are thinking of the low cost adapter board I designed to test vacuum tubes on a Tek semiconductor curve tracer. My adapter is not limited to the 576. It works on ANY Tek curve tracer (575, 576, 577, 7CT1N, and 5CT1N). Contact me OFF-LIST at "dennis at ridesoft dot com" if you would like a copy of the paper I wrote about testing vacuum tubes on Tek curve tracers.

Dennis Tillman W7PF

-----Original Message-----
From: Chuck Harris
Sent: Wednesday, August 14, 2019 5:17 AM

I would have to beg to differ, the 577 has the same left/right sockets, left/right lever switch, and as such, comparison capability as the 576.
It even uses the same dual transistor plugin adapters.
It (with the right option) even has a split screen storage capability.
What it doesn't have is any form of on screen readout display of the settings.

-Chuck Harris wrote:
On Tue, Aug 13, 2019 at 07:59 AM, Mlynch001 wrote:

One of the best finds of mine was a very nice Type 576 Curve Tracer
(at a great price). The 576 has indeed helped me repair other
equipment. More importantly, it has greatly increased my
understanding of all these little pieces of black plastic with various wires protruding from the sides.

Michael Lynch
Dardanelle, AR
That's exactly the model I would like to find. The 577 is smaller but lacks the ability to do A-B comparison testing. The 576 can do vacuum tubes too, with the right test fixture if I'm not mistaken.


Dennis Tillman W7PF
TekScopes Moderator

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