[TenTec] Argonaut 505 alignment, filter, mod?

[geoffrey mendelson]

On 1/20/2014 6:55 AM, Neil Martinsen-Burrell wrote:
>
> 2) I am primarily interested in CW with this radio and so I am looking for
> a narrower audio filter.  I have seen a Model 208 CW audio filter for sale,
> but it is set up for use with the accessory jack on the Argonaut 509.  The
> TenTec wiki says "a slight modification is necessary when using the filter
> with the older Model 505 Argonaut. Service Note SN-6-505 details the
> modifications."  I assume that the slight modification is to separate out
> the audio in, audio out and power in lines.  Does anyone know how to obtain
> a copy of that service note for more details?
>
>

I don't know about the 505, but the 509 was occasionally modded by 
replacing the 4 pole crystal filter with an 8 pole one from a Triton 
IV.  I think the IF sections are similar enough to do it, but I would 
check with someone who did before you do.

My 509 had the S/SWR meter bulb go, so I replaced it with an LED bulb. I 
was going to replace the dial light bulbs with LEDs, but so far they 
still work. I think they were rated at a higher voltage than they are 
used at, so they won't burn out quickly. The S/SWR meter bulb can be 
reached from the top, the dial light bulbs require you to pull the front 
cover. Something I did to restring the dial, but hope not to do again 
for a long time.

You can see my 509 station if you look me up under my Israeli call on 
QRZ. :-)

Geoff.

-- 
Geoffrey S. Mendelson 4X1GM/N3OWJ
Jerusalem Israel.