Search results

Tantalums have the advantage of operating better than electrolytics where certain frequencies are involved. They are also longer lasting and more stable but more expensive. Would be best to replace it with one of a higher voltage rating such as 35 volts. May last longer, but hey 44 years ain't...

Andy, I think you meant 2312

I've done business with Ken for years. I just ordered a couple of crystals. Ordered them by email like I usually do. It took 5 weeks and 2 extra phone calls to get them. He's always good to talk to though. He does seem to be getting slower and slower at getting things out but at his age it's...

One thing about SAMS is that they usually rewrote the schematics and renamed everything so it becomes confusing when one tries to compare them to the original. Once you understand that and know what you're looking at it's not a problem. They can actually be easier to read than some originals...

That is the same cord as the Realistic TRC 458,457 and others use. You can find them on Ebay just by searching for TRC 458 or 457.

They show the production numbers on them on page 2.

Here's the SAMS for the TRC 458/457

It's test point 10, the emitter of TR401 at 13.80 vdc. You can also measure it at C94 on the board but use a transformer can or the metal dividers by the PLL section for ground as the chassis and the board do not share ground.

Just happened across this thread and I see no one answered your question. If you are using the original schematics, that resistor is R22 and if using a SAMS CB-23 schematic it is R44. It is on the grid (PIn 2) of the 12AT7 mic amp tube. It's a 4.7 meg resistor.

Here's a speaker that I bought a few years ago that fits. It's tight but will go in without modifications. It's from Parts Express #292-457 and it's only $6.39.

Chris Here are the last two steps from one of your previous posts that you said you didn't have: 11) SET R145 FOR REASONABLE CLARIFIER RANGE. R145 IS THE ONE CLOSEST TO THE EDGE. 12) CONNECT FREQ. COUNTER TO SYN.BOARD OUTPUT, SELECT MANUAL MODE, SET CLARIFIER TO 12 O'CLOCK, SET R143 (THE...

I remember in 1980 when Mt. St. Helens erupted. It was quite a bit darker here in the east for a few days until everything finally blew over.

If the B&K can only generate the actual CB channel frequencies then you will need another generator capable of generating the other frequencies needed. You could just inject the signal in the antenna jack as stated in the third step and adjust A1 thru A11 for maximum keeping the output voltage...

Here's what I think is part or maybe all the instructions and schematic for the FC70 and schematic for the FT76.

Here's a manual showing the different types available.

I don't know the dates of these but here are a couple of old ads.

I don't have a radio to look at but if you use an ohm meter you can find which solder pad is grounded. You will have to get a ground point from the main board as the chassis is not grounded directly to the boards in that radio. The ground pad will be on the larger circuit area of the power...

That is the main filter cap for the power supply. If you are running off AC power it needs to be there otherwise you will have quite a bit of hum in the radio. It is possible that someone installed one under the board. I have seen this done before when someone wanted to add more capacitance for...

I know this is a bit old but 357 was wondering about channel skips. I have a CPI 300 that has a switch on the front like that Digicom 100 does and it is for 5k skips. Some one added it to it. Mine also has a different chip that allows it to go to channel 79. I read an explanation a while back...

Here's some info on the 300. Also if the radio has a green dot on the TA sticker on the back it was modified at the factory for improvements for the noise blanker, ambient noise level and modulation warble on SSB.