Re: Tek 555 part needed.

Keith Knox
 

Garrett,
If you email me your shipping address I will send you a replacement HV Supply for your 555 scope. You can replace the full supply or just T901 as you wish. I will test HV Supply in one of my working 555 scopes before shipping.
I have a collection of 75+ of the Tek 500 series scopes. Included in this collection is 6 of the 555 scopes.3 of the 555 scopes have been fully refurbished and are working great. I hope to get 1 more 555 scope refurbished, but the other 2 will most likely be parts units.
I will test the HV Supply this afternoon and have it ready to ship.
Keith Knox
hptekman@...

On Tuesday, February 9, 2016 12:16 PM, "lbfulton@... [TekScopes]" <TekScopes@...> wrote:


  Morris/John,
Here's the pin voltages I read today on both beam HV supplies:
V900 pin1 +223.6 V800 pin 1 +47.6
pin 4 0 pin 4 0
pin 5 -.294 pin 5 -.278
pin 6 -17.9 pin 6 -51.5
pin 7 0 pin 7 0
pin 9 +310 pin 9 +311

V914 pin 1 -145.6 V814 pin 1 -1.3
pin 2 -149.8 pin 2 -160.8
pin3 -150 pin 3 -150
pin 4 -.292 pin 4 -.267
pin 5 -.292 pin 5 -.267
pin 6 -145.6 pin 6 +52.0
pin 8 0 pin 0
pin 9 0 pin 0


The high voltage test points are at the anodes of V962, LB and V862 UB.


CRT pin 11 -681
pin 12 -760
pin 4 -1275
pin 2 -1337


My tube tester won't work on V900/800, but I swapped them side to side with no change in the problem. V914/814 both check good. With the help of you guys, I'm getting a better understanding of how this circuit works and seems to me T901 might be putting an excessive load on the circuit as was already mentioned. Haven't worked much at all with these old tube circuits since '68 when I was a Marine in Navy avionics school. Can't unsolder the trans, and check the resistance as my left hand is in a cast for 2 more months. Emailed a fellow today who might be able to rewind T901 for me though. I really appreciate the input from you guys.


Garrett




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