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Old 10th October 2004, 10:32 AM   #1
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Question 35Z5GT half-wave rectifier

Does anybody out there know where to find a schematic of an audio amp that uses a 35Z5GT half-wave rectifier?(other than an AA5 radio) Any help would be greatly appreciated. Thank you.
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Old 10th October 2004, 08:19 PM   #2
Enzo is offline Enzo  United States
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The only reason anyone ever used that tube was to put it with something like a 50L6 and some preamp tybes and run them off the AC mains without a transformer. Think cheap. So other than AA5 radios, you might look for little record players and stuff.
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Old 10th October 2004, 10:51 PM   #3
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Thanks Enzo! Took your advice(think cheap) and in the meantime I found a schematic that uses the 35Z5GT and a 50C5. Since we have 220 volts here I'll use a 2:1 step-down transformer(should also help someone, namely me, from being fried). Site address: http://webpages.charter.net/dawill/tmoranwms/
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Old 11th October 2004, 03:25 AM   #4
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They were also used in inexpensive guitar practise amps of the 60's era. You might find those in pawn shops and second hand stores.
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Old 11th October 2004, 04:03 AM   #5
Enzo is offline Enzo  United States
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Look in the back of the RCA manual at the 1 watt phonograph amp. That uses the 35W4, but could easily be made with the 35Z5.

You won't find any circuits using just the 35Z5. They will all have other odd heater voltage tubes in there with them.
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Old 12th October 2004, 09:25 AM   #6
SHiFTY is offline SHiFTY  New Zealand
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I would be very, very careful about building an amp without a mains transformer. The outside of your cd player, or indeed the strings on your guitar, could be at mains voltage.

I would throw this tube away and use a proper mains transformer, a GZ34, and some 6L6GCs or EL34s!
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Old 12th October 2004, 12:37 PM   #7
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Thanks for your warning SHiFTY but as I told Enzo I will be using a 2:1 stepdown xformer cuz our line voltage here is 220 volts. My main reason for using this tube is that I happened to come across it completely by chance and it got me excited(intellectually, not sexually) about building something with this technology. As an electronics technician it will be a learning curve after which I want to attempt to bulid a "serious" tube amp.
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Old 13th October 2004, 01:40 AM   #8
Enzo is offline Enzo  United States
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Be careful. If your transformer is an autotransformer, you will have no isolation from the mains. Many step downs are autoformers. If it has true separate primary and secomdary wiring, then you get isolation.
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Old 15th October 2004, 06:26 AM   #9
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@Isaac Teller

I built a pair of SE monoblocks using 35W4's, 50C5's and 12DT8's quite a few years ago with 1 to 1 iso-xfrms. Sounded quite good amazingly and was fun to build. I had a lot of those tubes lying around at one time long ago. Aaahhh the good old days; sob!

Go for it!
Wayne
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