Ed -
Yes, it is a special diode, a PIN switching diode. You "can" use a
1N4148, etc., but filter blowby (or signal loss!) may be a problem
depending upon which diode is it. These diodes are used to switch the
various filters in and out.
MPN3404s are readily available from W8DIZ and others.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
E VICKNER wrote:
I picked up a TR7 yesterday at a hamfest. Upon opening the radio up I
noticed that one of the MPN3404 diodes on the filter board had a
broken lead.
Is there anything special about the use of this particular diode of
the filter board or can I substitute a general purpose switching diode
for the broken one?
Tnx & 73 Ed K2ZE
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