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I did check the bias Driver & Final bias to 30/50 and like I said the red glue on these 2 pots are not broken pots are at factory setting. Sideband finals are fine. AM finals are fine but the AM regulator gets real hot. Today I was going to keep it keyed and see if the TIP41 would blow but did...

Ok Brandon i appreciate your guidance in trying to get it working 2 heads are better than 1. LOL

I will check the bias tomorrow and I can use my fluke meter for that. It gets hot in 10 seconds I counted and real hot after that. An all the stuff you see in the pictures is glue they used and the red glue on the pots on some are a pain to clean off so you can adjust them. Why do that when...

I just removed power the violet wire that is pinned on the radio where the am audio pot is. I removed and of course no output but my freq counter read the frequency on am and ssb and there was slight modulation . I did not feel any heat from the am regulator TIP41. And I tried to find c191 and...

Bias never been touched the red goop/glue still in place. I thing is the power wires are the bias wires that come from the final area and then go over to the right where there are pins that are plugged into. The are fully covered in hot glue. I will remove them and see what happens.

the power supply is my first supply Pyramid bought back about 35 years ago and has been a good supply. Ok I will remove the jumpers are those for the bias. I never seen a board like this one most all areas like the bias jumpers and final areas and the pll area are covered with good amounts of...

I received the TIP41 replacements today. The stock KTC4369 is a plastic case with no mica insulator needed. The TIP41 has metal backing so I had to make hole bigger in chassis and use some mica insulators with white thermal paste. I replaced the TR41 and turned on radio. Radio keyed up about 4...

I just ordered replacements from Amazon 20 of the TIP41 for $8.00. the KTC4369 seems to be scarce around here in States or pay $10.00 for 1. Or get them from Aliexpress and wait 3 weeks. So Ill try the TIP41 replacement and have spares. I will also replace TR42-2sc945 have plenty of those. Until...

I think im going to order the KTC4369 replace it and see what happens. Th mic audio is crystal clear and the 2 watt dead key will peak at 4-5 when you AHHH or whistle into the mic. SSB no problems just on the AM side as I posted.

I did check a few electro caps and all seemed ok no problems. Brandon7861 I dont have an exact schematic for this 148 NW ST radio. IC4 seems to be the MB3756 and dont think this radio has one as I dont see one. Is there another point i can check the voltage. The front mode switch for am/ssb is...

The radio was working with 5 watts swing to about 8 on am then I noticed the 2 watts am. SSB is 15 watts AM with 2 watts has good audio. external power supply is 14v @35 amps. the AM amp pot works it will adjust to 0 watts then to 2 watts as I described. When adjusted to 0 dead key and you talk...

brandon7861 emitter in recv 10v trans 4.72 collector in recv 12.3 trans 11.34 base in recv 7.73 trans 7.38 here is a short video on my google drive

Brandon7861 Im just getting back to the 148GTL NW ST just 1 radio. Sorry for the confusion. I replaced the TR38 2166 driver and the TR36 1969 final and same results 2 .5 watts on AM. So on this radio TR41 they use a KTC4369 and on the emitter when I key the radio voltage drops to 4.6 volts with...

Well put this radio on the shelf about 3 months ago and now back trying to find out why LOW AM output of 2 watts. The radio is all stock SSB power is 15 watts the AM output is only 2 watts no matter what I do to tune the radio. Also seems the bright/dim on the radio does not get that bright...

Thanks Brandon as I mentioned this project has be put aside and will be posting my next one having problems with a 148 gtl

Well I have decided to put this project on the shelf and find another problem which I will post in a few days. Thanks to all who posted help and suggestions.

Should be 14.910 for the low channels not 15.360 which is the stock xtal for regular 40 channels. My mistake

Do you have any pictures of the pll one i have pictures of the regular one? Does the pll one give the 40 channel banks like 40 up and 40 down? thanks

brandon7861 im trying to do the 40 up/40 down bands instead of the pll mod that has channels in different positions. As as mentioned the Viagra boards did this and no longer made. There are some floating around but trying to get this on my own.

Thanks for all the suggestions. Again just having fun. So I tried NZ8N suggestion and if i disable/unsolder the 15.360 xtal and then inject the 15.810 for high or the 14.910 for low it will work great on Am dead center. SSB is off as I mentioned and explained in the above post. Also the voice...