Ok, I did some more searching, and I came up with this. Some of the +3 mics came with a TIS58 FET, and some with a 2n3219 bipolar. The TIS58 subs to an NTE132. Data sheet here:
http://www.nteinc.com/specs/100to199/pdf/nte132.pdf. Hope this helps. 73s.
- 399
Great information: Thanks.
Shoosh was wondering LOL. I have been toying for a couple of years with an idea to assemble a Mic compressor fallowed by a Clipper AKA PC196 board or even AKA Lou Franklins board.. Turner board copy might be the ticket or Knight compressor copy.
Hopefully I have both among 14 Turner + 3 's ! Look at the reviews on EHamNet
on this 40 + YEAR OLD desk mic. !
This FET has a very High Impedance. Which matches the ceramic cartridge. I wonder if
the three mics that I thought were barely working are simply your mentioned differences.
Another Post possibly. But. These 3 websites are very helpful in finding antique/vintage
transistor substitutions. The first. Vetco. Is a old electronics dealer. EG. by typing into
Google.......Vetco NTE132. You will get an exhaustive list of OEM part #s that
NTE132 replaces. Several times. I have looked in my Junk Pile & found an OEM part with an OEM number to replace a part I needed. By reverse Substitution on Vetco.
These two Websites may well be the last functioning Transistor substitution data bases in the Internet world.
http://english.electronica-pt.com/components-cross-reference?ref=TIS58
http://www.icreplacements.com/T/TIS...ubstitute-equivalent-part-cross-reference.htm
http://www.vetco.net/catalog/product_info.php?products_id=1955
I owe I owe.Off to work I GO !
The L4 mod upgrade is Awesome. I heard local stations last night that did not move the meter on a Cobra139XLR.
If not to tired from work. DIY RF Probe for my VTVM. I found a Service Monitor identical to the one on the U-Tube video on the L4 mod in UK. $1,200.00 US + shipping. Oh well. Guess will have to keep using my Laptop audio generator
and signal generator with freq. counter.
Best