Need Palomar300A tubes for spares!

[nosaj]

Just asking since being around tube equip on the audio side things canbe rewired to use different tubes.
Here is a link to a site I've used for guitar amps before Think it's like 270 there.
https://www.amplifiedparts.com/produ...ower-amplifier
nosaj
N1EBC

[whiteastro]

Just asking since being around tube equip on the audio side things canbe rewired to use different tubes.
Here is a link to a site I've used for guitar amps before Think it's like 270 there.
https://www.amplifiedparts.com/produ...ower-amplifier
nosaj
N1EBC

Thanks for the suggestion, I will start checking these sources Monday when businesses open!

[ARF2001]

I've managed to get a couple sets of outputs for the Palomar 90A on E-Bay for reasonable prices, but it's only a 2 tube amp. Seeing as the TV sweep tubes aren't nearly as robust as real transmitting tubes and these old amps tend to eat output tubes like candy, other than for the fun of it I'm questioning the worth of bothering with it too much longer. It won't take very many tube replacements to get to the cost of something like a new Dave Made base amp that not overdriven can be a lifetime investment without a lot of the headaches.

[whiteastro]

I've managed to get a couple sets of outputs for the Palomar 90A on E-Bay for reasonable prices, but it's only a 2 tube amp. Seeing as the TV sweep tubes aren't nearly as robust as real transmitting tubes and these old amps tend to eat output tubes like candy, other than for the fun of it I'm questioning the worth of bothering with it too much longer. It won't take very many tube replacements to get to the cost of something like a new Dave Made base amp that not overdriven can be a lifetime investment without a lot of the headaches.

Believe me I hear what your saying and I've thought of what your saying many times and that is why I haven't ordered 6 replacement tubes yet. I do that twice and I'm already on my way to buying a newer amp. I suppose a lot has to do with how much time you have to devote to being on the air. My unit has two external accessory cooling fans mounted on top to help dissipate the heat. How about it JJD how long do you get out of a tube set?

[JesseJamesDallas]

Believe me I hear what your saying and I've thought of what your saying many times and that is why I haven't ordered 6 replacement tubes yet. I do that twice and I'm already on my way to buying a newer amp. I suppose a lot has to do with how much time you have to devote to being on the air. My unit has two external accessory cooling fans mounted on top to help dissipate the heat. How about it JJD how long do you get out of a tube set?

I have yet to burn up a set...I bought my "Kicker 500" back in 2012 used off ebay, and it had weak tubes in it when I bought it...So I replaced them with a New set, plus bought a extra set just to have as spares...The first set I bought are still working like new, so i'm not sure if I will ever use my spares.

The Palomar 300A I have, has the original tubes still in it, and when I had the box in the shop having a rectifier diode replaced I had the tech check the tubes, and they all tested good and strong...

IMO, if you run these type tube amps the way they were intended, they should last a long time...But if you over-drive them, or maybe have high SWR, then they won't last any longer than a pill box would being abused the same way.

One other side note...Don't get too hung-up on tubes getting hot...That's what tubes do! These tubes were designed originally for old TV set's...Ever see a old TV set with a fan in the back to cool the tubes?..........no

[whiteastro]

I have yet to burn up a set...I bought my "Kicker 500" back in 2012 used off ebay, and it had weak tubes in it when I bought it...So I replaced them with a New set, plus bought a extra set just to have as spares...The first set I bought are still working like new, so i'm not sure if I will ever use my spares.

The Palomar 300A I have, has the original tubes still in it, and when I had the box in the shop having a rectifier diode replaced I had the tech check the tubes, and they all tested good and strong...

IMO, if you run these type tube amps the way they were intended, they should last a long time...But if you over-drive them, or maybe have high SWR, then they won't last any longer than a pill box would being abused the same way.

One other side note...Don't get too hung-up on tubes getting hot...That's what tubes do! These tubes were designed originally for old TV set's...Ever see a old TV set with a fan in the back to cool the tubes?..........no

I was figuring on ordering 8 tubes in case some came thru shipment broken and I would go from there. I know and appreciate the theory why the man added the extra cooling fans on top of the amp case. It's called a once of prevention is worth a pound of cure Yes the tubes were made to get hot but how about the other resident electronic parts inside the cabinet. I think resistors, diodes, capacitors, transistors, and all the other parts that make the system work. How do they enjoy all that heat and what does it do to them. I'm no electronic wizard so I can't argue anything, I just read an try to learn. The guy installed the fans wrong in my opinion and I will change them. He put the fan in the 2 tube bay blowing down and the fan in the 4 tube bay blowing up. I want them both blowing up because heat rises!

[JesseJamesDallas]

I was figuring on ordering 8 tubes in case some came thru shipment broken and I would go from there. I know and appreciate the theory why the man added the extra cooling fans on top of the amp case. It's called a once of prevention is worth a pound of cure Yes the tubes were made to get hot but how about the other resident electronic parts inside the cabinet. I think resistors, diodes, capacitors, transistors, and all the other parts that make the system work. How do they enjoy all that heat and what does it do to them. I'm no electronic wizard so I can't argue anything, I just read an try to learn. The guy installed the fans wrong in my opinion and I will change them. He put the fan in the 2 tube bay blowing down and the fan in the 4 tube bay blowing up. I want them both blowing up because heat rises!

So did the guy take out the factory fan then? Originally the 300A had a fan that sat between the driver tubes and the 4 final tubes...

You would be surprised at just how much heat all those parts inside can handle...Even with fans blowing, tube amps still get plenty warm...And one thing i've noticed with mine, is the hotter it gets, the more watts show up on the meter...Now that could just be harmonics playing with the meter, but at any-rate, it put's a smile on your face watching the needle on the meter swing!