Palomar 300A refresh. Assume nothing.

[1iwilly]

Not bad thanks for the info i sent my to a amp builder in the NE he is going to re-do the 40 and 20-meter band with the correct setting and fix the low side input trimmer with a pot in the back of amp so every time the band is switched simple to adjust

 

[nomadradio]

Putting in what Palomar left out is what's needed.

73

 

[1iwilly]

Putting in what Palomar left out is what's needed.

73

yes

 

[BJ radionut]

NOMAD: If you pay any attention to your Ebay Sales dept. you will note and order from me.
Story begins. I took a 300A in trade years ago for ??
Couple years ago decide it was time to move it forward. Tested tubes / cleaned her up / fired up ...Works all bands 40 thru 10...300 to 400 watts carrier on high drive w/(6 watts drive)...Good to go. Took to XENIA, priced her at $275 as a start...by time to leave was asking $225...took it home placed on shelf...Now 2+ years later, time to move...cleaned the dust and realized this thing had antique caps! OK had some in-house...swap out the 2/450v and 2/25v...caps. Lace up some very ugly wiring.(that old wire is brittle)and closed her up.
Flip the switch...dark...nothing... WTF ...Check fuses ...both blown...OK Dumass!!! what did you F'up swapping out those few HV parts...Looked things over, even to a point of removing the board to check for a solder bridge or stay splatter...nada...OK Dumass wtf is up!
Pictures and more in Part 2
All the Best
Gary/W9FNB

PS: I have surmised this is a VERY late production 300A/White face/Chrome top...
This has 4/6KD6's finals...2/ 6lf6's drivers

 

[nomadradio]

Check fuses ...both blown

Ah, "both"? It came with one fusholder on the rear of the RF deck. We adopted the habit of putting a 15 Amp fuse in a holder on the power transformer to protect the low-voltage winding. Found that a short on the 12 Volts alone might not trip the AC fuse in time to protect the 12-Volt winding, especially if someone had used a 30-Amp fuse.

I would start by pulling the tubes and trace for a short to ground on the 12 Volts AC.

73