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Deepdark

    Quebec, Canada
STA LEVEL - TURRET BOARS LAYOUT New
« on: September 09, 2014, 11:08:00 AM »
Hi

Jst wanted to share with you my turret layout for a STA Level. For those ineterested in this project and like to build on turret board, it could be nice to use this layout. Anyway, enjoy it :) let me know if you got some ideas or see any mistakes

Looking at the transformers, the original specs appear to be something like 1:10 (input) and output something like 8K:600!??

Possible alternative:

1:1 (10K:10K), 1:4 or 1:5 in input (600:10 or 15K) should work fine, resulting in better and less sensitive input control (Cinemag, Edcor, and other brands should have these values). Dripp uses Sowter 9062 1:4+4. Don't know how it is wired, though. Probably 1:8

4:1 in output (something like 10K:600) should be enough. Drip uses Sowter 9185 8K:150 (7.3:1).

I guess with a lower ration there is no need for the input pad!?

Any thought about the transformers options/alternative. I'm I correct?

I was asking myself about something on the 1960 schematic. They strapped a 200K resistor across the secondary of the iinput transformer. They didn't do that in the previous schematic. Is it a kind of load for the input? They strapped it just before the dual 100K pot.

 ;D
« Last Edit: September 09, 2014, 04:02:07 PM by Deepdark »
"I'm givin' you that money so I don't have to kill your ass."


Deepdark

    Quebec, Canada
Re: STA LEVEL - TURRET BOARS LAYOUT New
« Reply #1 on: September 09, 2014, 11:08:37 AM »
power board and meter/switch board.

Concerning the power board, I forgot to put the C13 cap (Between the CT of the filament and HT). The power transformer hookup isn't drawn. Just strap the 5V tap on pin 2 and 8 of the 5Y3, pin 4 and 6 to the 500V.
Depending on the size of the C12's caps, they could have to be install out the board.
« Last Edit: September 09, 2014, 04:30:01 PM by Deepdark »
"I'm givin' you that money so I don't have to kill your ass."

Deepdark

    Quebec, Canada
Re: STA LEVEL - TURRET BOARS LAYOUT
« Reply #2 on: September 09, 2014, 11:10:01 AM »
For the ground, probably a ground wire like the original will work great. Or we could give some ground points, like on the LA2A, a try.
"I'm givin' you that money so I don't have to kill your ass."

Gustav

    DK
Re: STA LEVEL - TURRET BOARS LAYOUT
« Reply #3 on: September 09, 2014, 01:41:07 PM »
Hi

Jst wanted to share with you my turret layout for a STA Level. For those ineterested in this project and like to build on turret board, it could be nice to use this layout. Anyway, enjoy it :) let me know if you got some ideas or see any mistakes

 ;D

Thanks! - this looks great

Gustav

Deepdark

    Quebec, Canada
Re: STA LEVEL - TURRET BOARS LAYOUT
« Reply #4 on: September 09, 2014, 01:50:10 PM »
Thank you :) I'll try to post the design with the wiring to all component :)
"I'm givin' you that money so I don't have to kill your ass."

Deepdark

    Quebec, Canada
Re: STA LEVEL - TURRET BOARS LAYOUT
« Reply #5 on: September 09, 2014, 01:53:18 PM »
By the way, the pads aren't included on the design.
"I'm givin' you that money so I don't have to kill your ass."


 

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