Author Topic: SA-3A (LA-3A Clone) Support Thread  (Read 29382 times)

Harpo

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  • Posts: 1934
  • Rahden, Germany
Re: SA-3A (LA-3A Clone) Support Thread
« Reply #280 on: April 17, 2014, 09:57:01 PM »
The shunting LDR resistance between T4B-pins 5/6 is missing in your measurement and will bring your voltages down.


salomonander

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  • Posts: 213
Re: SA-3A (LA-3A Clone) Support Thread
« Reply #281 on: April 18, 2014, 06:40:14 AM »
The shunting LDR resistance between T4B-pins 5/6 is missing in your measurement and will bring your voltages down.


thanks a lot. so this is alright? i can just go ahead and plug it in? cheers

salomonander

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  • Posts: 213
Re: SA-3A (LA-3A Clone) Support Thread
« Reply #282 on: April 19, 2014, 05:29:38 PM »
may i bump this again? im very confused. everybody told me that pin5 should be connected to ground. which is not the case on my units. what am i doing wrong? any help is appreciated. all this is measured without the t4b in the socket.

Harpo

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  • Posts: 1934
  • Rahden, Germany
Re: SA-3A (LA-3A Clone) Support Thread
« Reply #283 on: April 19, 2014, 08:03:25 PM »
everybody told me that pin5 should be connected to ground.
These 'everybodies' relate to the LA3A. You are building a SA3A that has pin6 of the T4B connected to ground instead. The LDR inside the T4B that connects between pins 5/6 doesn't care.
Quote
all this is measured without the t4b in the socket.
so put it in circuit and your measurement will behave ...

salomonander

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  • Posts: 213
Re: SA-3A (LA-3A Clone) Support Thread
« Reply #284 on: April 19, 2014, 08:10:23 PM »
great! thanks a lot.
btw: i checked my (unfinished) silent arts la2a and it was the same. no ground connection on pin5. i assume its a similar issue (not an issue at all). cheers

salomonander

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  • Posts: 213
Re: SA-3A (LA-3A Clone) Support Thread
« Reply #285 on: April 21, 2014, 11:20:57 AM »
and thanks again. it works now and sounds great!


 

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