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As I wrote before, I am looking for a replacement for my broken WY2 voltage stabilizer tube. I found some 50's vintage Raytheon OB2 tubes locally, but they are quite expensive.
I also contacted with Tube World and he offered several pair, but, according to his web site, some of them use argon gas and others (later ones) use neon gas. I asked the seller and he wrote: "Before 1970 most argon purple pink color gas, after 1970 all neon red.
If your Chinese tubes lit up red they used neon gas."
As my tube is fried, I cannot say whether it lit up red (perhaps, yes).Is it critical whether I buy a tube using argon or neon gas? May I destroy the player if I use a wrong tube?
So far, I asked a friend to loan me a Mazda OB2 tube with a pink base (whether argon or neon), so that I can check it with my CDP.
Follow Ups:
Did you change the PSU rectifier from tube to solid-state? Wonder what is causing the excess current draw, which is melting your regulator tube?
You sure you don't have dried up filter caps or a short to ground?
No, I didn't change anything. Other things must be checked by a technician.
I should try a new OB2 voltage stalilizer; if it doesn't help, I will bring it to a tech.
My visual inspection of caps did not show anything (except that a part of the casing (or whatever is its name) of one Multicap got unstuck...
Sounds like excessive current draw. Did it melt after a cold startup?
I guess you can try another OB2 (or equivalent). But, if this happens again, better have that unit checked out by a tech.
Good luck!
I did not "witness" its melt-down and cannot figure out when it happened, because the lid was closed and the problem (interupted sound) occurred long ago. I noticed the melted tube last Sunday when I opened the lid to make pictures.
It is just a voltage voltage reference tube that will eat 20mA or so at a given cut-off voltage, in this case 105-108 volts. If you put in a. It is just like a zener. If you replace a OB2 with another OB2 there is absolutely no harm, regardless of the gas in the tube.
Put in a different voltage tube, and you will have other issues.
I got a couple of NOS Mazda OB2 tubes yesterday and replaced the faulty tube. The skipping remains, which means that a thorough disgnostics are required. Or, perhaps, I should try a new laser head.
I understand. I hope to try a new OC2 tube soon...
I hope to try a new OC2 tube soon... > >
You mean 0B2. Don't use a different voltage.
There are 2 ways to use this kind of voltage regulator
1. Dropper resistor before it. Value must be correct and this is covered in datasheets
2. DN2540 type regulator before it set for 17mA plus whatever the tubes after it draw
One other thing - you can't use capacitors after these regulator tubes. The most you can use is .068uF in parallel with the tube between B+ and ground.
Yes, OB2...
As far as I can judge, there are no capacitors after this tube; there is one 6Z4 rectifier near it and some resistors..
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