Pride dx300 blower upgraded.

[TetroideTom]

About to bring some new life into a couple old Pride Dx-300. Love them Nomad boards!
Just wondering if anyone has tried to use a blower like used in the larger Ameritron amplifiers in a Dx300.
Looking at the size in the diagram it might just be able to be made to work.
35cfm is better then the 13 or so cfm you get using the common dayton blower that normally gets used as a replacement.
Going to be using a 8930 / dx393 tube and just wanting better cooling.
Hate to desecrate the back panel mounting a blower like I've seen some do.
Any suggestions?
Thanks Thomas

EBM G2S085 G2E085 Blowers – CTR Engineering, Inc

 

[nomadradio]

Used to have a picture of a blower mod one of my customers did to his Pride. Found that a plastic caulk-gun tube was a near-perfect fit for the old blower's metal flange. It was tall enough to protrude through a hole in the top of the cabinet cover. A blower with a 2-inch round flange was bolted to the top of the cabinet and used the caulk tube as a duct.

Looked quite odd, but did the job. Made it a PITA to take apart and reassemble.

More air is always good, especially if you go for the 8930 type tube. Had a guy tell me years ago that too much air is not desirable. Found the quote in Eimac's book "Care and Feeding of Power Grid Tubes". Airflow is only excessive if it dislodges the tube from the socket.

We use a Dayton 1TDN1 or equivalent. Has just enough capacity for the stock 250 tube and fits without an act of congress.

73

 

[TetroideTom]

I've used this same dayton blower over the years. I'm sure i first heard about it from you on wwdx.
Takes care of the noisy blower problems. Just doesn't push enough air for me. I get long winded.
May have to order the one I posted above and see how it works out.
Too bad I couldn't find a used one to check it's fit ability. The new one is pricey at $135.00 . But for the extra cfm probably worth the investment to cool a pricey 8930 tube.

 

[nomadradio]

No such thing as too much air.

73