Recent content by ira parker

UPDATE, went ahead and reinstalled the channel mod (the right way) then broad banded it. frequencies came out the way they should, 1-7 normal 8-40 up to .805 everything tuned good and balanced out very minimum lose on the upper channels like a 1/2 - 3/4 watt difference put the covers on sending...

Thanks TM86, I hadn't seen a channel mod using pin #7 or isolation of pin #19 without the resistor to ground. The 12 count on the binary makes sense on the confusing freqs on 1-7. The mod in the realistic section on cb tricks made more sense to me but was a little short on the schematic. So when...

Never mind on issue #2. Rolled the dice light burnishing with 4000 grit and they seem to be holding fine. Thanks Ira

PC-196BD I have several issues with this one? History, recapped it using [EL CAPO (399) RIP] list for upgrades, d-23 replacement, c179 swap from tantalum, removed channel mod, did a modified variable dead key following Nomads version (I use a fixed resistor for dead key instead of the variable...

Thanks Nomad, Yes I'm using the list from the old write up only had a few I wasn't sure about. Appreciate the input. Don't mess with a lot of these old tubers just wanted to double check. Got all the caps ordered went with the JJ multi cans the rest is pretty straight forward until I get to the...

Doing the 40yr/100k mile tune up. I see some resistors denoted as wire wound and some as metal oxide I'm assuming the rest are just regular metal film? Don't like to assume just double checking. Thanks Ira

Would like a little input on some upgrades to the bench. Frequency counter, I have doesn't read lower frequencies (455, 4.400, 6 mhz) not looking to break the bank I'm fine with older used units that have decent specs. Oscilloscope, my old Tenma 72-6820 has dropped 1 of the channels and giving...

Look at this setup on the bottom side of the board I believe it accomplishes the same thing as the jumper on c258 much easier on bottom of the board. Yeah nay maybe? What's your thoughts. Diode to collector sb754 resistor to plus side of c260.

Hey LC, I have got her running right with the single final so I'm not messing with making it dual. Operator error on my part I'd just done a quickie touch up on the alignment for initial testing, went back through it and found the ssb apc was quite low at max power after adjusting it up to 12.5v...

Thanks Mike, I do a modified version of the mod without volting the finals mainly do it to keep the modulation clean by controlling the negative peaks and for full out put from a low dead key to drive the amp. On the older boards I've been using the 817/1012 combo with great results the 817 runs...

High SP5IT, I know this is an old thread but I just picked one of these 2995dx radios up and am going to do this mod. Question is about upgrading Q67, on some of the other radios I've done (galaxy) we replace the sb754 with a 2sb817 and a 2sa1012 as the companion part (q67) I have a few of them...

P.S. got a fan kit coming and a 40amp switching power supply coming for it, think I got a good deal for 250$ she's really clean and the original box and all the paper work.

Yes that's the alignment service manual I'm using, I did find the ssb apc quite low at 9 volts so brought that up to 12.5 volts rf power at max boy what a difference ssb will now peak 150-160 pep and it brought am up. I tried to set am apc at 6 volt rf power at max but it was way to hot when I...

First off I want to thank you both for your inputs, addressing the concerns I was thinking about. Now let me rephrase some of my terms and thinking. 2995dx is a stand alone transmitter with a stand alone amp built on the back so I call the 2166 a driver and the 2312 the final in the radio, the...

Looking for some advice on the main board? The service manual shows ept695011a mine is a 2005 model with the ept695014b? I'm assuming the alignment is the same? The only mod I see is the limiter has 1 leg lifted. I would like to do a few more mods to it, 1st is adding a second final all the...