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Catalog 7 is a supplement to the other 6.? Dated Oct. 1984,it is a collection of notes, specs, and advice in a looseleaf tabbed notebook.

=========================================================================

Don't forget Catalog #8 "TRANSISTORS, DIODES & MISC. CATALOG"

21 sections. No date found on mine (so far).

Paid $80 to get this one!


Rolynn
Tek Bvtn and Sunset 1966-1971

On Aug 24, 2018, at 4:39 PM, ROLYNN PRECHTL K7DFW <k7dfw@...> wrote:

Catalog 7 is a supplement to the other 6. Dated Oct. 1984,it is a collection of notes, specs, and advice in a looseleaf tabbed notebook.

=========================================================================

Don't forget Catalog #8 "TRANSISTORS, DIODES & MISC. CATALOG"

21 sections. No date found on mine (so far).

Paid $80 to get this one!


Rolynn
Tek Bvtn and Sunset 1966-1971

-----Original Message-----
From: Leon Robinson
Sent: Thursday, August 23, 2018 6:59 PM

Kurt,
I'm curious how many of these Catalogs are there?
? Leon Robinson? ? K5JLR

There appears to be no problem actually, when i open the PDF from the link it works fine all the pages show just fine.
When I open the downloaded version on the computer it works fine also.
It was only the one that opened after I clicked the download arrow that did not reproduce all the pages correctly at the end of the 11 section going into the 12 section I was getting an error message that these pages would not open so it is just a glitch with to many copies I think.

Jim

On August 23, 2018 at 7:48 AM Kurt Rosenfeld <kurt.harlem@...> wrote:


This scan was made possible by Pete Lancashire.

-----Original Message-----
From: Leon Robinson
Sent: Thursday, August 23, 2018 6:59 PM

Kurt,
I'm curious how many of these Catalogs are there?
Leon Robinson K5JLR

On August 23, 2018 at 7:48 AM Kurt Rosenfeld <kurt.harlem@...> wrote:


This scan was made possible by Pete Lancashire.

Lettering is mostly gone on most of the push switches. I have a parts 475 with
good lettering and am curious if I would have to swap the whole switch
assembly or do is there an easier way?

Fabio I have been following this thread out of curiosity and looking at the
schematic in my 466 book for this circuit and it is weird. If Q1486 does not
have a good ground to mains earth it seems to me it wont work correctly? Why
the two primary windings? for that HV transformer and how is the AC created to
make it function?

Jim

On August 23, 2018 at 10:29 AM Fabio Trevisan <fabio.tr3visan@...>

wrote:

Hello Mark,
OK... so Q1486 is an original Tek (as it has the Tek part number) and it's

checking OK... This is better news than worse... even though it's one less
explanation for the problem, at least it's an original one which is a great
relief, since it being anything else would sure mean bigger problems (to find
one that would work).

As innocent as Q1486 is (being a low frequency transistor), the problem in

this circuit is the circuit itself... From what I learnt on my own 464 issue,
which David Hess was so kind of walking me through, the circuit is so finnicky
that it's more likely for it to not work than it is likely to work.

That said, the "critical" element in it is Q1486 having its parameters just

right (not a matter of being outstanding, nor poor, but just right)... and
that is what you get when you have the correct Q1486 part number (which you
got, bingo!).

Now, while the transistor is the correct one (and seems to be in working

order), it's still true that the circuit is finnicky and works very
marginally, so it doesn't take much for it to not work.

If it would be me, I would start by disconnecting from T1501, everything

that's not strictly necessary for the H.V. regulation feedback loop to
work...Namely:

1. The output to the voltage doubler (the whole voltage doubler board that

is on the side of the 464.

2. The diode that recitfies the +600V that goes to the Storage board (and

keep the NON STORE button pressed).

There's no harm in operating the scope without either of those voltages.

Without the voltage doubler there won't be 7kV of Post Deflection
Acceleration, but as I was once thaught, the CRT would still work (although
very dim and with a wrong deflection factor).

That's for a start... and when I have the schematics at hand, I can think of

something else to try.

Rgrds,

Fabio









On Thu, Aug 23, 2018 at 11:52 AM, <kickingypsy9@...> wrote:

i did check Q1486 first time around, its a rca but it also has 151-0140 on

it

..dont know if its original but it checks ok.i also cleaned the place

where

the wire hooks to it. i took the rca out, and put a 2SC3280 in, and just
soldered it the board to see if it would run.....hooked up my scope to pin

3

and powered it up...wow its running,went to see if i could see any
display,nothing,checked again ,it stoped running.one thing i noticed when

i

powered it off the crt light completly up then faded to a dot in the

center.so

i know the hv came up for a moment.puled out my transister it still checks
ok.i still have Q1492 the protect trans out of circuit.so...i either have

a

intermitted T1501 or somthing weired going on with that oscillator

circuit.i

tried freezing and heating the board,no change. i tend to think its the
circuit,i dont see why that output should be anything speacial.its just a
115wat medium speed audio output.but still changing it made it work for a
second ???what the hecks going on here!!!

On August 23, 2018 at 10:29 AM Fabio Trevisan <fabio.tr3visan@...> wrote:


Hello Mark,
OK... so Q1486 is an original Tek (as it has the Tek part number) and it's checking OK... This is better news than worse... even though it's one less explanation for the problem, at least it's an original one which is a great relief, since it being anything else would sure mean bigger problems (to find one that would work).
As innocent as Q1486 is (being a low frequency transistor), the problem in this circuit is the circuit itself... From what I learnt on my own 464 issue, which David Hess was so kind of walking me through, the circuit is so finnicky that it's more likely for it to not work than it is likely to work.
That said, the "critical" element in it is Q1486 having its parameters just right (not a matter of being outstanding, nor poor, but just right)... and that is what you get when you have the correct Q1486 part number (which you got, bingo!).
Now, while the transistor is the correct one (and seems to be in working order), it's still true that the circuit is finnicky and works very marginally, so it doesn't take much for it to not work.
If it would be me, I would start by disconnecting from T1501, everything that's not strictly necessary for the H.V. regulation feedback loop to work...Namely:
1. The output to the voltage doubler (the whole voltage doubler board that is on the side of the 464.
2. The diode that recitfies the +600V that goes to the Storage board (and keep the NON STORE button pressed).

There's no harm in operating the scope without either of those voltages. Without the voltage doubler there won't be 7kV of Post Deflection Acceleration, but as I was once thaught, the CRT would still work (although very dim and with a wrong deflection factor).

That's for a start... and when I have the schematics at hand, I can think of something else to try.

Rgrds,

Fabio









On Thu, Aug 23, 2018 at 11:52 AM, <kickingypsy9@...> wrote:

i did check Q1486 first time around, its a rca but it also has 151-0140 on it
..dont know if its original but it checks ok.i also cleaned the place where
the wire hooks to it. i took the rca out, and put a 2SC3280 in, and just
soldered it the board to see if it would run.....hooked up my scope to pin 3
and powered it up...wow its running,went to see if i could see any
display,nothing,checked again ,it stoped running.one thing i noticed when i
powered it off the crt light completly up then faded to a dot in the center.so
i know the hv came up for a moment.puled out my transister it still checks
ok.i still have Q1492 the protect trans out of circuit.so...i either have a
intermitted T1501 or somthing weired going on with that oscillator circuit.i
tried freezing and heating the board,no change. i tend to think its the
circuit,i dont see why that output should be anything speacial.its just a
115wat medium speed audio output.but still changing it made it work for a
second ???what the hecks going on here!!!