Hi,

Radiodaze and Tubesandmore are out of 35Z5s.

Does anyone have other sources?

Thanks.

Try Electron Tube Enterprises,

:Hi,
:
:Radiodaze and Tubesandmore are out of 35Z5s.
:
:Does anyone have other sources?
:
:Thanks.

Hi Mike

That is something. 35Z5 used to be very common. Why not order 45Z5? They are interchangeable. With high line voltage, a better tube. Better hurry, now that I posted this others will be after these tubes.

Norm

:Hi,
:
:Radiodaze and Tubesandmore are out of 35Z5s.
:
:Does anyone have other sources?
:
:Thanks.

Thanks for the suggestion. I just tried ordering two 35z5 tubes and ran into the same problem - no tubes left. Just placed my order with AES for the 45z5. Mark from Kalamazoo

Try Antique Electronic Supply

:Hi,
:
:Radiodaze and Tubesandmore are out of 35Z5s.
:
:Does anyone have other sources?
:
:Thanks.

:Hi,
:
:Radiodaze and Tubesandmore are out of 35Z5s.
:
:Does anyone have other sources?
:
:Thanks.
Hi All,
We could have seen this coming. Plug in an AC/DC radio with shorted filter capacitors, or let the probe slip, and the 35Z5GT is ruined.
What are the prospects for 45Z5GT and 35Y4 futures!

All the Best,

Bill Grimm

Thanks Everyone.

I guess it is time to stock up.

::Hi,
::
::Radiodaze and Tubesandmore are out of 35Z5s.
::
::Does anyone have other sources?
::
::Thanks.
:Hi All,
: We could have seen this coming. Plug in an AC/DC radio with shorted filter capacitors, or let the probe slip, and the 35Z5GT is ruined.
: What are the prospects for 45Z5GT and 35Y4 futures!
:
:All the Best,
:
:Bill Grimm

:Thanks Everyone.
:
:I guess it is time to stock up.
:
:::Hi,
:::
:::Radiodaze and Tubesandmore are out of 35Z5s.
:::
:::Does anyone have other sources?
:::
:::Thanks.
::Hi All,
:: We could have seen this coming. Plug in an AC/DC radio with shorted filter capacitors, or let the probe slip, and the 35Z5GT is ruined.
:: What are the prospects for 45Z5GT and 35Y4 futures!
::
::All the Best,
::
::Bill Grimm Also hard to design a solid state replacement for use in a series filament string,but it could be done. Has a tapped filament for dial lamp voltage tap.

Good grief! Well, you can also use a 35Z4 as a direct replacement, if you don't want to use a 45Z5, though a 45Z5 is a good option for to-day's higher line voltages. For the pilot lamp you have several options, since a 35Z4 doesn't have a pilot lamp tap. My favorite is to wire two 6.8 or 7.0 volt zener diodes back to back, and then parallel with the pilot lamp. For a .15 ampere string, you will need one set of zeners for each pilot lamp. For a .3 ampere string, you can use one set of zeners for up to two .15 ampere bulbs in parallel.

When using the two back to back zeners with a 35Z4, put them in series with the filaments only. Connect the plate of the rectifier to the line cord through a 50 ohm resistor instead of through the pilot lamp. Sending B current through the pilot lamp when using zener diodes not only isn't necessary, it puts added stress on the zeners. It was necessary when using the lamp tap of the 35Z5. The 35Z5 lamp tap alone was designed not to supply the bulb with enough voltage so that it would be protected during a cold turn-on. The extra B current, which would only be available once the radio warmed up, would then make up for what the lamp tap couldn't supply on its own. Zener diodes will protect the lamp well at all times.

Try the zeners and a 35Z4 (or try a 45Z5).

I can't believe that 35Z5s are running out. That is sad!!!!!!!!!!!! That's why we shouldn't just replace tubes for the sake of replacing tubes. I've heard that a lot from people--that they just replaced all of the tubes to be on the safe side........which is a waste of tubes. I wish I could win the lottery or something, because I'd start my own factory and manufacture 35Z5s and G style tubes (I'd probably make 35Z5Gs in the ST-12 size. That'd be great!!).

T.

I tend to think that as NOS stocks of popular tubes run low, the Chinese or Russians will crank up their tube factories. That's what has happened with popular hi-fi and guitar-amp tubes.

But, on the other hand, the modern hi-fi and guitar tube market is probably much larger than for old radios. NOS WD-11s are scarce as hen's teeth, and sell for a king's ransom - yet nobody today manufactures replacements. I guess it's because so few people want to listen to broadcast AM on a Radiola III, or even collect such sets.

And that brings up another thing. Modern tube-type hi-fi and guitar amp owners often play them frequently and hard - burning out tubes by the bushel. And even if they aren't burned out, their owners may replace the power and rectifier tubes on general principles.

Most of us don't play all our old radios that much to present a major demand for replacement tubes. Our need for tubes is most often when restoring an old radio, and then it's a one-shot deal.

NOS 2A3s are just as scarce as 45s. But because 2A3s are popular in modern tube-type hi-fi amps (as well as in old radios), they are in current manufacture - but 45s aren't.

For years, quite a few old radios have sold for less than the value of their tubes alone. It seems like that trend might continue?
Doug

:
:I can't believe that 35Z5s are running out. That is sad!!!!!!!!!!!! That's why we shouldn't just replace tubes for the sake of replacing tubes. I've heard that a lot from people--that they just replaced all of the tubes to be on the safe side........which is a waste of tubes. I wish I could win the lottery or something, because I'd start my own factory and manufacture 35Z5s and G style tubes (I'd probably make 35Z5Gs in the ST-12 size. That'd be great!!).
:
:T.

I searched a lot of tube sale sites for 35Z5gt and notice that many are going up in price if they even have them but most don't have used ones anymore.

Gary at http://www.Oldradioparts.com said he can't seem to get used ones much anymore... but his NOS ones are $5.10 each

I got to thinking about 35z5 substitutes and checked my own stash as well.

Seems I have 14 of them NOS and 4 used ones. So 18 tubes should be enough for a while.

I was going to grab some NOS 45z5 tubes ($3.30) as well just to have around here..and I may still do that.
And certainly 35Y4 (used $2)is good if you want to change sockets.
But...I also noticed he sells used 35W4 tubes for about $1.95 so there's a cheap solution too!

...and I see that I just happen to have a TON of 7 pin 35W4 rectifiers here....lol
I probably have 20 or more of them.
You could either get a 7pin socket and swap sockets or make a hybrid too.
I tried a hybrid. I just sawed off the top of an old dead 6sk7 metal tube octal base and soldered wire leads from a 35W4 to the associated pins in the octal base. Works beautifully.... and not hard to do.
(probably easier than changing chassis socks)
If you can hide or dress up the wire connection interface area with a little potting material it won't look too bad.

34W5 to 35Z5 hybrid Franken-Tube:
... here it is...lol
The base could probably be epoxied nicely to hide the wires I'm sure.

Another choice is to leave the 35z5 out altogether and feed the remaining filaments with a 1/2 wave diode (this pulsating DC actually creates approximately an effective 84volts potential to the filaments.... although your DC voltmeter will only show about 56volts)

Then use another diode to run the B+ with a 100 ohm resistor in series to lower the voltage a bit going into the pi-filter.
I tried this tonight too... and it works just nicely.... although the 100 ohm resistor should be about 3-4 watts.

Here's my hybrid franken-tube:

AES sells 35Z4s for about $2.50 a piece. They will work well in any set that doesn't have a pilot lamp, and for a pilot lamp, you can either sub a 40-50 ohm resistor or two 6.8 to 7.0 volt zeners wired back to back.

T.

:Hi,
:
:Radiodaze and Tubesandmore are out of 35Z5s.
:
:Does anyone have other sources?
:
:Thanks.

A quick Google search yielded several other supply houses that have 35Z5s in stock and in ample supply/reasonable prices. Remember, Google is your FRIEND.

Mike