[GreenKeys] ST-6: Tuning The Filters

[Ralph Mowery]

For an assortment I would say look on ebay.  They have lots depending on
what material you want them made out of.

Example:

http://www.ebay.com/itm/278-Pcs-30-Values-470pf-470nf-Polyester-Film-Capacit
or-Assorted-Assortment-Kit-/301737684407?hash=item4640f7adb7:g:D-UAAOSwax5Yx
ved

For about $ 8 shipped from the US.  

China has lots if you don't mind waiting about 3 weeks.  I don't have any
source to recommend, but I have ordered lots of inexpensive things from
China and the US from ebay.

You do have to be  wary  of any of the solid state devices from China.  I
have not ordered any transistors from China, but have heard that sometimes
they do not measure up.



> -----Original Message-----
> From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
> tony.podrasky
> Sent: Friday, March 24, 2017 12:38 PM
> To: Green Keys
> Subject: [GreenKeys] ST-6: Tuning The Filters
> 
> GM OMs;
> 
> Back around 1970 I got my ST-6 kit.
> 
> When it came time to tune the filters, I borrowed an oscilloscope,
> audio generator, DVM, and a huge bag of capacitors. I spent an entire
> weekend tuning the ST-6 until all the filters were tuned as close to
> perfection as was possible. It looked (and still does) pretty ugly
> inside, but has worked since then.
> 
> I recently picked up an ST-6 that was built by HAL.
> The person who wired it did a phenomenal job - but the tuning leaves a
> lot to be desired. This really isn't a problem - because its sole use
> is to copy the ARVADA ITTY channel, where there is no QRM or static,
> but the display on the oscilloscope, well, STINKS!
> 
> QUESTION:
> 
> I've been out-of-the-loop when it comes to building stuff, and want to
> know is there a variable capacitor available now that has a good enough
> "Q" so that I can use that instead of cut-and-try fix-value caps?
> 
> If not, does anyone know a source where I could get a bag of multiple
> value capacitors?
> 
> UE,
> K2EAA - TONY
> NNNN
> ZCZC
>