I searched Amazon and E-Bay. I did find the devices to be available at
reasonable prices.
73
Bob, K4TAX
On 6/15/2020 11:23 PM, Josh Gibbs wrote:
Thank you very much for the files Bob!
Ten-Tec replaced both the MRF-476 drivers and the MRF-475 finals with
Mitsubishi 2SC1969. I checked with RF Parts and 2SC1969 is NLA.
Anyone on the list have a source for these? A bit of web searching turned
up a company called Eleflow who is reproducing them, but I found a lot of
mixed reviews (mostly CB related stuff!).
Thanks,
-Josh WU7H
On Sun, Jun 14, 2020 at 7:41 AM Bob, WB2VUF <wb2vuf@verizon.net> wrote:
Hi, Josh,
Congratulations! The Century 22 is a very nice rig. I bought one used
some years ago. They are quite rare, but get very good ratings. It's a
good rig for casual operating and nets. It isn't so good for contests on a
crowded band because being direct conversion, you get QRM from both sides
of zero beat. However, the audio filter is excellent.
A word of caution: It is important to use the original power supply and
to make sure that the current limit is set correctly, or use a fast-acting
5 Amp circuit breaker in the 13.8 V line. The C-22 has no internal SWR
protection, so without current limiting or a breaker, a few dits
transmitted into the wrong antenna will destroy the finals instantly. I
learned this the hard way.
I have a scan of the manual which I will send you. It's a little better
quality than the Ten Tec scan. I got it off the G3YCC web site. My copy
has some typed notes from G3VTT on the table of contents page regarding
bias settings and final replacement. Ten Tec replaced the original MRF-475
finals and MRF-476 drivers with the 2SC1969, which are more robust.
Genuine Mitsubishi 2SC1969s are available from RF Parts Co. Beware of
on-line sellers who market counterfeit 2SC1969s for the CB market.
73,
Bob WB2VUF
<#m_-8709170805919571873_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
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