Drake t4xc manual

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Special financing available. See terms and apply now See terms and apply now for PayPal Credit - opens in a new window or tab. Any international shipping and import charges are paid in part to Pitney Bowes Inc. Learn More - opens in a new window or tab International shipping and import charges paid to Pitney Bowes Inc. Learn More - opens in a new window or tab Any international shipping and import charges are paid in part to Pitney Bowes Inc. After 40 years of wanting a set of Drake twins I found some in good condition and bought them.

However during some testing the T4XB transmitter is causing me to pull my hair out! I recently cooked the cathode resistor and replaced it along with two different sets of NOS finals.. It makes full power on 80 meters and almost full power on 40 but will only make about 75 watts output on 20 and less than 30 out on 15 and almost nothing on 10 into a 50 ohm dummy load.

I have replaced the finals twice! Replaced the driver, IF amp and almost all other tubes in the transmit train other than the pre mixer amp but nothing changes the loss of power as the freq goes up. Somebody has bound to have run into this before Save me from having to build an RF probe and poke around in the chassis and throw me a bone here! Are you testing the transmitter alone? K5RT , Nov 26, The T-4XC has held up very well!

I use a fan to keep final tubes cool. Built like a tank! One of the best transmitters ever made! After alignment and a couple tubes, I paired it up with an updated R4C.

I use it on all the WARC bands too. I did install a small muffin fan on the back to save the finals AND brought the AM carrier level up mod. It is a wonderful transmitter and measured right up against the best of the modern radios. Makes for a supreme transceiver with the R4C. Well, I just can't figure out why someone else hasn't already posted a review! Where R U, Drake aficionados? This vintage beauty deserves a "5", because it's well built, covers all bands - 10 plus WARC bands with a few crystals - and remains a genuine pleasure to use on the air - that is, if you appreciate "hollow state" rigs!

If you keep its switches clean, it will go on working without trouble. Some people badmouth it because of its 6JB6A final amp - "Not a true-blue transmitting tube", they say. Well, I think that if the user knows his way around tubes, those 6JB6As should last a long, long time - my T4XC still has the original ones, and they're running strong - I get more than W out on all bands. A small muffin fan at the back of the rig, blowing air out, will help the tubes a lot.

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Don't review home brewed equipment or home-brew copies of commercially made products. I recently decided 2 years later that I should finally get it working. The next problem I found was an open resistor in the driver circuit. The transmitter now started to show a little output on some bands but was far from working properly. The manual had alignment instructions. I followed their alignment sequence but developed my own alignment method.

An oscilloscope really came in handy here. I also used a homebrew RF sampler that was used at the transmitter output. The sample port was connected to an oscilloscope and proved very useful for setting the carrier oscillator, carrier balance and optimizing the output power. After completing the transmitter alignment it put out good power up to 20 meters.