Here we have for sale a new, freshly-built AND TESTED printed circuit board for the input and relay circuits in a Pride DX300 base amplifier.
The price you see is the same price we listed in 2017. The next batch of this type relay will cost use more. When I find out how much, the price for this listing will rise.
Fair warning.
My cost for this relay just keeps going up. This version is now sixty bucks higher than the version with NO relay. If you find a deal on this relay, you could save a few bucks buying the one with the empty relay socket.
This is the assembled, tested board WITH the main (antenna) relay only. ANYTHING else you see in the pictures is for illustration purposes only. This auction is for the assembled, tested pc board you see. NO PREAMP. AT ALL!
JUST THE ASSEMBLED, TESTED CIRCUIT BOARD YOU SEE, * WITH * THE RELAY! **NO** RECEIVER PREAMP!
**NO** preamp! **NO* preamp!
We have this board listed *without* the relay. It's cheaper.
THE FIRST PICTURE *ONLY* SHOWS THE EXACT ITEM YOU'RE BUYING.
THE *REST* OF THE PICTURES ARE REPRESENTATIVE, AND WERE SHOT USING A PREVIOUS SETUP THAT LOOKS A LITTLE DIFFERENT. They still demonstrate how to install the board in spite of the small visible differences.
What you see is what you get. This board is assembled, tested and ready to install. As with all self-installed electronics, it may not be returned. If you hook it up wrong and blow it out, you are welcome to buy another one and try your luck again.
This product uses LETHAL high voltages when installed in a working amplifier. BY BUYING THIS PRODUCT YOU HEREBY AGREE NOT TO KILL OR INJURE YOURSELF in the course of using, installing or even looking at it. If you do, and your estate sues me, I will file a countersuit for three times as much claiming breach of contract. You did agree not to, after all.
If you have not executed the "Suicide Intervention" procedures shown on our web site, this would be a good time to take care of that. Find my other Ebay listing for the DX300 HD High-Voltage board, and click on the link in that listing. If you skip that stuff, you could still witness a case of "assisted suicide" when you key the radio into your Pride the first time.
They say a link to a YouTube video is allowed.
https://www.youtube.com/watch?v=KZ2XerPfjUI
The sharp-eyed viewer will observe that there is no combination of a coil and capacitor on the two wires leading to the antenna socket. The stock DX300 has a capacitor C61 grounded to the antenna socket. Sometimes C61 is a pair of capacitors in series. Attached to the other end of C61 is a small air-core coil made from bare wire, marked L14 on the schematic. L14 makes the actual connection from the pc board to the center pin of the antenna socket.
THESE TWO PARTS ARE NO LONGER NEEDED! In a nutshell, I have simplified the function served by these two parts with a single small ceramic disc capacitor soldered to the foil side of the board, under the relay socket. Okay, part of what makes this possible is that I have eliminated the preamp's wiring and relay from the amplifier's standby circuit. Any amplifier placed in line with a radio on standby causes the radio's SWR reading to rise above the antenna's normal reading. The tiny disc cap in the picture takes care of this, and the connections to the antenna socket are each with a single straight wire. No more worrying about the bare wire of L14 touching some nearby object and causing an arc! If the preamp were still wired in place, this single disc cap would probaby not do the same job by itself.
There is NO PREAMP, and no socket for the preamp relay. If you have enough on the ball to build the rest of the preamp circuits yourself, you won't need any help from me on that.
THERE IS NO INSTRUCTION SHEET! THERE IS NO WEB PAGE WITH A STEP-BY-STEP PROCEDURE. NONE! AT ALL!
If you have not yet downloaded the excellent and elegant updated 2004 service manual for this amplifier, you should do so. It's posted at www.cbtricks.com Look under "Amplifiers" and the letter "P". If you can follow what's presented in that book, you can install this board without my help.
THIS IS A SINGLE-BAND BOARD! It has NO connections for the input section of the band selector. It has an input circuit for 28 MHz, plus or minus 1.5 MHz more or less. The parts that routinely overheat and fail in this section have been upgraded.
The white wire with the solder lug on the end goes to the center post (control grid) of the tube socket.
The big fat rectifier diode seen on the top side of the board is a reverse-polarity protection diode for the grid-bias circuit. When a tube overheats from excess drive it will arc inside. This shoots hundreds of Volts of POSITIVE-POLARITY DC into the tube's (negative-polarity) grid-bias circuit. This diode serves to protect the bias control from surges caused by a bad or damaged OR OVERDRIVEN tube. Not foolproof, just fool-resistant. But it does prevent damage to the bias control and grid choke. Yes, it's ugly, but it's effective.
IF YOU NEED THE PICTURES FROM THIS LISTING AS A GUIDE, I SUGGEST YOU SAVE THEM TO YOUR HARD DRIVE **NOW**.
Hint: Click on the picture to blow it up as big as it will go, then right click over the image. Select "Save picture as", and choose a suitable folder THAT YOU'LL REMEMBER to stash them in for later. Sooner or later, everything expires on Ebay, especially pictures.
Oh, and did I mention THERE IS NO RECEIVER PREAMP ON THIS BOARD!
This is a technical product that has NO worth at all without the skills to install and use it. If you insist on "hot-rodding" this amplifier with excessive drive power, you'll eventually damage this board just like the damaged or worn-out one you're replacing. Might take longer, but overdriving a Pride just wears things out prematurely. Feel free, it's your money to burn.
IF YOU DON'T KNOW HOW TO DECIDE WHERE WHICH COLOR WIRE PLUGS IN, THIS IS PROBABLY *NOT* A GOOD "FIRST-TIME" PROJECT. And if you CAN find your way around the schematic diagram and wiring layout shown in the manual mentioned above, you can probably do the job and even do it right.
If you know what it is and what it's for you can decide if you need it or not.
And if you don't know what it is you DON'T need it! Trust me on this.
We ship USPS Priority Mail no later than the second business day following receipt of payment.
ALL SHIPMENTS OUTSIDE USA AND ITS COLONIES IS BY
*** GLOBAL SHIPPING PROGRAM ***
*** NO *** EXCEPTIONS!
All routine Ebay precautions apply. Scammers take your nonsense elsewhere.
Please.
Thanks for looking and 73.