Fwd: Looking for Tektronix 4051 or 4052 Display Board

[Pete Lancashire]

---------- Forwarded message ---------
From: Pete Lancashire <pete at petelancashire.com>
Date: Tue, Jul 3, 2018, 2:18 PM
Subject: Re: Looking for Tektronix 4051 or 4052 Display Board
To: Monty McGraw <mmcgraw74 at gmail.com>


Yeah the two display boards went to Europe.

If anybody needs three perfectly good 11 inch CRTs, deflection yolks
excetera come to Portland Oregon and they're yours or have somebody pick
them up for you they're in the scrap pile and scrap is going in about a
month. Each CRT contains about $35 worth of gold.

On Tue, Jul 3, 2018, 2:12 PM Monty McGraw <mmcgraw74 at gmail.com> wrote:

> Pete,
>
> I'm in Texas near Houston.
>
> The Display Board is the vertical board to the left of the CRT.  It has
> several cables at the bottom to pin headers and the cable to the neck of
> the CRT.
> It also has connectors to the power transistors that simply unplug when
> you remove the Display Board.
>
> Here is a picture of a display board:
> https://drive.google.com/file/d/0Bxd4qJinVzkNOFZacFZSYVJwaHc/view?usp=sharing
>
> Monty
>
> On Tue, Jul 3, 2018 at 4:01 PM, Pete Lancashire <pete at petelancashire.com>
> wrote:
>
>> Is 206 Washington ? I have the remains of a 4051 4052 and 4010 terminal
>> sitting outside in the scrap pile. Parts have gone to Europe but they're
>> still pieces left over
>>
>>
>> They were about 25 miles west of Portland Oregon.
>>
>>
>>
>> On Tue, Jul 3, 2018, 1:35 PM Ian Finder via cctalk <cctalk at classiccmp.org>
>> wrote:
>>
>>> These systems are rare enough that it's probably worth fixing instead of
>>> treating the board as a simple FRU. There are schematics on bitsavers for
>>> that board, and they are complete.
>>>
>>> On Tue, Jul 3, 2018 at 1:21 PM, Monty McGraw via cctalk <
>>> cctalk at classiccmp.org> wrote:
>>>
>>> > I've been repairing my Tektronix 4052.
>>> >
>>> > I've got the digital logic working - but the text and graphics are
>>> messed
>>> > up.
>>> >
>>> > I posted photos of the screens in my Tektronix 4052 troubleshooting
>>> thread
>>> > on vcfed.
>>> >
>>> > With a scope on the final X amplifier stage - it is oscillating - so I
>>> see
>>> > weird horizontal strokes instead of dots for text.  I know from the
>>> service
>>> > manual that this circuit includes a feedback loop, and with the scope
>>> I see
>>> > oscillation all around the loop - so I haven't found the source.
>>> >
>>> > Does anyone have a spare Tektronix 4052 (or 4051) Display Board that I
>>> > could buy?
>>> >
>>> > Thanks,
>>> > Monty
>>> >
>>>
>>>
>>>
>>> --
>>>    Ian Finder
>>>    (206) 395-MIPS
>>>    ian.finder at gmail.com
>>>
>>>
>