Search results

In the RCA Receiving Tube manual it's rated for 30 watts dissipation continuous, 200 watts temporary overload ▲not to exceed 40 seconds.

They have reasonable sounding receive and transmit and got pretty loud but they were plagued with PLL problems. That's why they were only around for a few years.

Just for reference, the resistor in the Heathkit Cantenna is a 50 watt unit. Submerged in oil it was rated/able to handle 1000 watts intermittently.

Once R8 opened, straight 12 volts went to the bases and would have blown both transistors and 10 ohms. It seems strange that R8 smoked again when you powered it back up after replacing it. Were you using your friends power supply? If so you might want to measure the output voltage and make sure...

One thing you can do to ensure symmetry between each 2 pill pair is to install one red dot and one non-red dot into each 2 pill pair. That way if there is a small imbalance, it's absorbed by the output transformer core and not the combiner resistors. I've done this successfully a number of times...

20 volts DC, no-load doesn't give enough headroom to regulate to 15 volts. You would need a transformer that floats (rectified and filtered) around at least 25 volts DC with no load. (transformer that delivers 18 volts AC, RMS)

Check the value of the silver mica cap across the output transformer. It's probably gotten hot and dropped substantially in value.

Just to add more info for confusion, the schematic that came in the box with every new Gladiator PLL40 mobile was actually the schematic for the Spartan PLL40 mobile (which is wrong). As far as I've seen their is no "actual" direct schematic for the Gladiator. When aligning/repairing a...

Yes, you could probably lower it to 1000pf and get "some" of your peak power back but I wouldn't go any lower than that. Besides, some of the power you were seeing could have been ghost watts from the SWR anomaly and not real anyway. Cheers though either way, I'm glad it worked!

C14 is usually the culprit, especially if it's a Mica (kidney bean). If C14 tests fine you can always check the value of C16 as well as both of these caps endure a lot of RF current.

If you are getting a high output standing wave on high dead keying, does it drop when you modulate? If so I have a possible solution. Some of the early DX250's and/or Killer Bee 250's ran a lower value mica cap across the output transformer. (430 or 510pf). That in and of itself isn't...

I'm not sure why but when I first saw the title of this thread, my brain saw "President Handy Andy2" ;)

Signing in from a desktop using Firefox with Adblock plus I never see ads or pop-ups. Are you signing in with a phone? Of course I also use NoScript but on this site I'm only blocking anything Google.

If they are the Deliverance Banjo's, according to Wikipedia it's the northern Georgia wilderness.. ;)

C84, the 1000uF 10V next to the PLL as well.

(After you discharge the high voltage) Check the relay that switches on the high voltage that feeds the plate chokes. If one of the contacts is welded closed, you can get "diode noise" from the tubes being energized while you are in receive mode. Diode noise usually sounds like a "bubbly"...

The combination of C13, R7 and R8 set the oscillation frequency and base bias of the inverter transistors, don't mess with C13.

I wonder if the TRC-222 is similar: http://73.235.100.209/radios/realistic/trc_222/index.html

Bluehost is/was the host. It's located in Utah.

Dmans is right, lots of tube radio's do that at first for a short time as the filaments come up to temperature but I was assuming you meant it was a slower process over several minutes.