finding alternatives for old part numbers?

[hostile]

I have some old radios like IC-745 that reference Icom part numbers with no indication on what I could use as a supplement.  I assume since these radios have long ago not been serviced by Icom that they can not supply the parts.   Whats a guy to do?  have lots of adjustable coils and chokes that corroded and falling apart. 

[mag_therm]

One item is to realize that old radios built after about 1978 are more difficult to restore than earlier ones with discrete components  for the reasons you mention and others.
I have restored a few tube and transistor units.
The best age seems to be between 1958 and 1975.
Substitution in those is mostly easy.
However IF coils and IF filters are difficult to find now.

[geggi1]

First you have to find the data on the original component. Icom where back in the 70s and 80s often delivering pretty good documentation
As far as I remember they used the original partnumber form the manufacturer not like today when they are using the internal Icom partnumber.
Then just start to use Google for substitute parts.
In some cases you might also be able to find donor radios/cards for your radio. Back then the same parts where often used in several radios

[hostile]

thats the problem,  no data on the component. Icom parts that have long ago vanished.

[geggi1]

start looking here.
http://www.radiomanual.info/schemi/ICOM_HF/IC-745_serv.pdf
You will find information about the components in the back of the SM.
Some parts will probably be hard to get especially intigrated circuits.

[hostile]

Been using the service manual, but all of the inductors and chokes use IC part numbers and there is no information on them.

[mag_therm]

I had a look at the service manual posted by geggi.
It seems detailed enough however I can imagine it would be difficult and time consuming to trace to a particular failed component.

With the "number" of  radios you have, can you just focus on one which has the least faults, and or the least visible component deterioration ?

At some stage you should consider write- off.
I like restoring old stuff, but selectively by age and of simpler complexity.

I have a new single board Hermes sdr transceiver on order, as it was  only $350 I would not consider  it worthwhile  to try to restore an old Japanese one.

[hostile]

For instance, PLL Uint, L8 (LS-162), PLL Sub-Unit LS201 ( LB-133 ).  Where is there any information on these parts,  What are the specs on them?