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    Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

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    Itchy

    Posts : 6
    Join date : 2017-11-04

    Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by Itchy on Fri Jul 27, 2018 6:30 pm

    Hello. I've been a DIY guy for 40 years now, built my own amps, eq's (Love the Marchand Bassis for my HT), built a great set of L,C,R, speakers (not very efficient unfortunately, currently powered by an XPA 5 from Emotiva), subs powered by 2 killowatt sand amps, etc, yada yada. I want to get around to building a pair of M125's.
    I have been lurking here for months, and reading quite a bit. Perhaps not enough, because here is my question: Why can't someone, somewhere, build a kickbutt rectifier? In other words, what is the physical limitation of making a tube that can pass say 500ma instead of the 270 or so that an expensive (and old!) GZ from the UK can? I have to think there is some physical limitation, or one would be available. I like the idea of having a 100% valve amp, but will likely have to go with the plug in solid state option as that seems to be the reliable setup. Could the 125 be set up with a pair of tubes, in parallel (obviously with a chassis mod), would the power transformer be able to handle two filaments?
    Anyway thanks. I know rectifiers have been beat to death, and that will continue until morale, eh current, improves! Shocked
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    sKiZo

    Posts : 1508
    Join date : 2013-04-01
    Location : Michigan USA

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by sKiZo on Fri Jul 27, 2018 8:28 pm

    They do ... the GG1-0.5/5



    Just not one that's plug and play in these amps. Bonus points if you come up with a conversion ...
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    cci1492

    Posts : 211
    Join date : 2016-05-09
    Age : 58
    Location : Bergen County NJ

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by cci1492 on Fri Jul 27, 2018 8:42 pm

    sKiZo wrote:They do ... the GG1-0.5/5



    Just not one that's plug and play in these amps. Bonus points if you come up with a conversion ...

    500ma/5kV...yikes!

    Itchy

    Posts : 6
    Join date : 2017-11-04

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by Itchy on Fri Jul 27, 2018 9:46 pm

    Nice! What is the voltage drop on that one? :-)

    That has a certain mean look to it!
    https://www.ebay.com/itm/Russian-High-Voltage-Rectifier-Tube-GG1-0-5-5-1-NEW-LOT-1pcs-/132026200606

    If the voltage drop was acceptable, other than having to run a wire for the output to a plug at the top, could it work? The pins look exceptionally tubby.


    The price is almost free.

    Itchy

    Posts : 6
    Join date : 2017-11-04

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by Itchy on Fri Jul 27, 2018 10:47 pm

    From here: http://www.russiantubes.com/prop.php?t=5&p=3 Current seems to be about 10 amps. :-(
    Oh well. No free rides, eh?

    Wait. Is that a mercury half wave?
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    sKiZo

    Posts : 1508
    Join date : 2013-04-01
    Location : Michigan USA

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by sKiZo on Sat Jul 28, 2018 1:04 pm

    Just have to build a separate power supply to drive one of them bad boys.

    (Didn't say it'd be easy, eh)  What a Face

    If you're really seriously concerned, the WS1 copper cap is rated to 1000ma. Never saw the need here myself - my GZ37 seems quite happy driving a quad of TungSol KT120's and 6SN7 driver at what some folk might consider insane levels.

    PS ... I still have a WZ68 copper cap here for backup. That's rated to 450ma and also still has the slow start that's missing on the WS1.

    Itchy

    Posts : 6
    Join date : 2017-11-04

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by Itchy on Sat Jul 28, 2018 8:33 pm

    To wet my appetite, I just ordered this little guy for an amp at work. Currently using a digital 3116 TPA that I have all of $14 into (and it sounds surprisingly decent). Anyone have any experience with china cheapie kits? https://www.ebay.com/itm/123063908099




    Pretty sure I will be sorely dissapointed but it's for work and not my "real" listening enjoyment. For $200 to the door, not expecting nirvana anyway.
    It's single ended and the speakers at the work crash pad are polk towers that seem efficient.
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    billinrio

    Posts : 78
    Join date : 2018-01-03

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by billinrio on Wed Aug 01, 2018 11:54 am

    Well, it certainly looks nice. I hope that you receive some answers with opinions about this kind of equipment from China.

    Itchy

    Posts : 6
    Join date : 2017-11-04

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by Itchy on Wed Aug 01, 2018 12:03 pm

    I'll post about it when I receive/ build it if you would like. New to this forum obviously, so I don't know if it would be bad form or not. It certainly is not anything near the standards of a kit from here (more toy like I think). I hope to build a pair of 125's in a few months...
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    billinrio

    Posts : 78
    Join date : 2018-01-03

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by billinrio on Wed Aug 01, 2018 2:45 pm

    Looks good to me. Nice, clean point-to-point layout.  I wonder if the build instructions are in understandable English.
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    Tubes4ever

    Posts : 121
    Join date : 2015-07-14
    Location : Star, Idaho

    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

    Post by Tubes4ever on Wed Aug 01, 2018 10:05 pm

    A 5V3A tube can easily handle 350mA. That's plenty capacity to handle the four tubes biased at 50mA each plus the driver tubes. Heater current is the same as a 5U4GB which is 3 amps. Easy to get on Ebay for a decent price.

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    Re: Hello from a Tube Wanna Be.. Yet Another Rectifier Question!

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