super bright glowing tubes WY3P

I just got this preamp and it has tubes that I am not familiar with. One tube is a WY3P another is a WY4P and the other strange one is a 5Z4P. Are there tubes that can be switched with any of these? Does "P" designate that is a Chinese tube? Makes sense due to the fact it is Chinese. But the interesting thing is the WY3P tube is like a night light. It glows so bright.

I was wondering what are the brightest glowing tubes (in normal operation) out there?

 

I had a pair of 165w triode monoblocks which used the 811A output tubes. Those things were like 25w light bulbs!
-Bill

 

The two front tubes look like 6SN7's to me. The rears look like radio (RF) tubes with the cylinder type plate assembly. Though I know they're not. The center looks like a 5Y4 rectifier tube.

Maybe check with the RCA tube substitution book. I think you can find it on-line.

 

The WY3P is the Chinese equivalent of the OC3 regulator tube. The WY4P is the Chinese equivalent of the OD3 tube. The 5Z4P is also a Chinese tube(yes, the "P" is the indicator) that you can substitute a 5Z4G tube with.

 

As said above, the rear outside tubes are gas cold-cathode VR tubes- they will glow rather brightly (from the gas inside being ionized, very much like a neon bulb) and in different colors depending on the gas used in manufacture.

The VR tubes make nifty night-lights too

 

That's pretty damn cool...

 

Really damn cool! I bet a lot of HiFi Bugs would love to have one of those!

 

The rear left tube is the WY3P, the center is a 5Z4P, the rear right tube is a WY4P and the two front tubes are 6H8C/6SN7's.