FS: AD561J's

Hi,

I have found a few tubes of AD561J's, around 100pcs. This is quite a
rare find and is a needed part, so I dont expect these to last long.
AMD still makes these but they sell for $32 in lots of 100pcs for
plastic ones, $50+ or ceramic ones. The ones I have are early 80's and
are the superior ceramic ones, and I am selling them way cheaper There
are 2 of these used on each of the following boards: Tac-Scan,
Eliminator, Zector, Star Wars, Space Fury, Lunar Lander, Asteroids,
Omega Race and Asteroids Deluxe. Some of the Asteroids and AD boards
that may have 6012's on there instead, as the later run boards allowed
you to use either with some hackery. The early ones as far as I know
only had slots for the AD561's. I also have some 6012's for sale if you
need those and some mc1495's that are used in the same section on the
atari boards. I can take Paypal payments at catfishh@bellsouth.net or
checks and MO's at the below address. Below are the prices

AD561J ceramic
1-9 $14.00each Shipping $1.50
10+ $12.00each Shipping $1.50

Just let me know what you need and thanks,
Mark Capps

Rodger Boots wrote:

> Zonn wrote:
>
>>On Wed, 10 Mar 2004 03:08:11 -0600, Rodger Boots <rlboots@cedar-rapids.net>
>>wrote:
>>
>>
>>
>>>>Since the Yoke and Resistor act like a voltage divider, and the voltage at FB is
>>>>held constant, then when V is at 25v, there is 1v across FB and 24v across the
>>>>yoke. Now when V jumps up to 30v, FB is still held to 1v, but now there is 29v
>>>>across the yoke.
>>>>
>>>>
>>>>
>>>>
>>>No, the yoke voltage doesn't change, the drop across the output
>>>transistors changes.
>>>
>>>
>>>
>>Thanks Rodger, that makes perfect sense!
>>
>>So would low gain, or a slow slew rate in the amplifier, allow ripple in the
>>power supply to make it through to the yoke?
>>
>>Power supply regulation does stabilize the display, and I'm just wondering why
>>that would be the case.
>>
>
>
> I'm betting it's a board layout issue more than a ripple issue.
> Probably the ground layout of the board.

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Received on Thu Mar 11 00:49:31 2004