[GreenKeys] ST-6: Tuning The Filters

[tony.podrasky]

Hi Ralph;

Thanx for the idea. They have some nice selections and at a very
good price, too.

UE,
K2EAA - TONY
NNNN
ZCZC


On 03/24/2017 10:03 AM, Ralph Mowery wrote:
> 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
>>
>
>

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