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Well, decided to switch it over to the D7 instead of D9 (since it's a 3600 board) and wow what a difference. It didn't bring the noise floor up but it sure did bring the signals up a lot. I just detuned the receive a little to compensate for the dramatic increase. Now the receive seems right.

Got the info from an article by FireBreather over at RadioMods.Co. Copy and paste: " "Super Ears" Modification - D9 HereÕs one that many folks ask me about and I was hesitant to include it here. This modification significantly lowers the effectiveness of diode D9 and greatly increases the...

It's called the D9 mod is all I know. It seemed to work on this old SSB Echo. Remove banded end of D9. Solder one lead of a 1.5k ohm resistor into the now empty D9 hole. Solder the other lead of above resistor to the free lead of D9.

Hi everyone, Got a Galaxy SSB Echo (another one) on the desk. As was the first one, and an Excalibur I had, this one presents low receive (ambient noise, noise floor) also. After I got the others to receive, I just let the receive go as it was, thinking that's about all I could get out of...

Update: Replaced both modulation VR's (checked them out of circuit also, both blown out). Resoldered R249 back together. Modulation set now. Shorted out TP3 and removed jumpers from TP to set bias properly. Driver - 50ma Finals - 50ma each (100ma total) World of difference. No power drop...

Turns out VR12 and VR14 is blown out. Checked them in circuit, nothing on ohm meter. Yanked them out and checked them, nothing on ohm meter. Checked others in the radio, all others show close to their stamped values. Hi and Lo carrier VR's are of newer types, as is all three VR's for the...

D92 I'm thinking is bad. I'll give an update when I get home and try it.

Again sneaky... Noticed I couldn't adjust the modulation VR's, so I suspected a limiter still clipped somewhere. Checked around and saw nothing clipped until I pushed on R249, then I saw the snip. Very neat snip, couldn't even tell it was snipped. Resoldered R249 back together, barely any...

Hmmm, sneaky people, lol... Just found a diode (1N4001) tucked under some wires and parts in the Passthrough area. This diode tied into the R238 circuit but closer to the Passthrough regulator, hid pretty good. Removed that diode, tested it out, so far so good. I've never mixed any swing mods...

Not sure what else to do. I've tried resetting the bias to 3.75v driver 3.50v each final and it still does it. Driver 3.75v, finals 3.50v each Driver 3.50v, finals 3.50v each Driver 3.20v, finals 3.50v each Driver 3.20v, finals 3.20v each No matter what bias setting I adjust to, the radio...

It's what he wanted in it. I prefer 2SB817 myself, then a TIP36C. Those two work just as good in my opinion.

So far, it's still dropping back on power (carrier and swing) after about 10 minutes of on and off talking (10 to 30 seconds at a time) and the heatsink behind the MaxMod/audio IC/8v regulator gets warm to hot, not scorching hot, the Mosfets get barely warm. The locals said it sounds great and...

Installed a zener on each final (I placed one on the driver previously). Reset bias. Reset key levels. Still drops after a minute or so, but doesn't drop back as much as before and climbs back up quicker than before. Nothing is getting anywhere near hot, Mosfets, Passthrough, AF, Audio IC...

Well, I figured I would hammer on it a few minutes before everyone else gets on the air just to monitor the output. 3w key with modulation - 40w, after 2 minutes the power dropped back again, same amount of drop as before. MaxMod cool to warm (barely warm). C145 not hot. Chassis behind audio...

Wow, I been testing the output through my antenna the whole time, my SWR is lowest on 26.885 mhz (1.1) and it's a 1.8 on channel 40 (haven't taken the time to readjust it). I decided to check it on my dummy load instead. Unholy crap, this radio is doing 60w PEP. Decided to try the output on the...

Got the new MaxMod installed along with a new AF regulator (just to be on the safe side). So far so good. Gonna hammer on it later this evening with the locals. I'll give an update later.

Decided to monitor the MaxMod voltages before and during this issue. Passthrough voltages: Receive Base - 13.23v Collector - 6.57v Emitter - 13.71v Transmit (Hi power - 10w carrier) Base - 12.12v Collector - 5.87v Emitter - 12.86 Collector increases to over 6v+ when the Passthrough starts...

I thought this was a new MaxMod he had put in here before he got it to me. When I got it, the MaxMod wasn't tightened down firmly, there was a gap big enough to slip just the tip of my ceramic tuning screwdriver in, just the very tip, and the regulator would actually move side to side with...

Current draw: Idle, receiving with volume all the way down - .25 amps. Transmit, carrier - 1.99 amps. Lo power, 3w carrier. Transmit, modulation - 3.45 amps Transmit, carrier - 3.65 amps. Hi power 10w carrier. Transmit, modulation - 4.88 amps When the power drops and gradually starts...

Well, tried using a zener across the driver (that's the only one the gate voltage climbs up with when it does this issue), no go, still same result. Left the zener on the driver and adjusted current draw like Nomad stated above (not his last post, but his post before that one) to 20ma for the...