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    Rectifier tube list?

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    Ernstmach

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    Rectifier tube list?

    Post by Ernstmach on Tue Sep 05, 2017 9:13 am

    Hi Everyone,
    possible stupid question......

    Have done some searching but cannot find a comprehensive list of recommended rectifier tubes.
    I have a couple of Sophia Princess Mesh Plate 274B's and was wondering if they could be used in my MKIII's.
    The 274's are supposed to be a replacement for the 5AR4.
    Figured I could use the extra heat this winter.
    thx!
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    peterh

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    Re: Rectifier tube list?

    Post by peterh on Tue Sep 05, 2017 10:57 am

    Ernstmach wrote:Hi Everyone,
    possible stupid question......

    Have done some searching but cannot find a comprehensive list of recommended rectifier tubes.
    I have a couple of Sophia Princess Mesh Plate 274B's and was wondering if they could be used in my MKIII's.
    The 274's are supposed to be a replacement for the 5AR4.
    Figured I could use the extra heat this winter.
    thx!

    5AR4 or it's european equivalent GZ34 is what is needed.
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    Ernstmach

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    Re: Rectifier tube list?

    Post by Ernstmach on Tue Sep 05, 2017 4:33 pm

    "5AR4 or it's european equivalent GZ34 is what is needed."

    Thanks for your response but it doesn't answer my question....
    I'm currently using the GZ34 and have used the 5AR4.
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    peterh

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    Re: Rectifier tube list?

    Post by peterh on Tue Sep 05, 2017 5:34 pm

    Ernstmach wrote:"5AR4 or it's european equivalent GZ34 is what is needed."

    Thanks for your response but it doesn't answer my question....
    I'm currently using the GZ34 and have used the 5AR4.

    GZ34 IS same as 5AR4. Only another name.

    Other tubes differ in properties, they might have larger voltage losses or they might have
    other demands on filament current.
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    Ernstmach

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    Re: Rectifier tube list?

    Post by Ernstmach on Tue Sep 05, 2017 5:40 pm

    "Other tubes differ in properties, they might have larger voltage losses or they might have
    other demands on filament current
    . "

    Thanks again. The 274 is supposed to be a direct replacement for the 5AR4 based on what I have read on other sites.
    I was hoping that someone here may have some experience with the 274.
    Thanks!
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    peterh

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    Re: Rectifier tube list?

    Post by peterh on Tue Sep 05, 2017 6:00 pm

    Ernstmach wrote:"Other tubes differ in properties, they might have larger voltage losses or they might have
    other demands on filament current
    . "

    Thanks again. The 274 is supposed to be a direct replacement for the 5AR4 based on what I have read on other sites.
    I was hoping that someone here may have some experience with the 274.
    Thanks!
    It is probably not usable, it mimics a 5U4 ( that has a larger voltage drop) but the
    most importent difference is that the first CAP in VTA is to large.
    Snippet from emissionlabs webpage (http://www.emissionlabs.com/datasheets/EML274.htm) :

    Just to give the classical warning once more, when you see more than 33uF on a 5U4G, or more than 4uF on a 274B tube, such a schematic is questionable



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    Ernstmach

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    Re: Rectifier tube list?

    Post by Ernstmach on Tue Sep 05, 2017 7:04 pm

    "Just to give the classical warning once more, when you see more than 33uF on a 5U4G, or more than 4uF on a 274B tube, such a schematic is questionable"

    Well, that does help!
    Thank  you!
    have a great day!
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    Peter W.

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    Re: Rectifier tube list?

    Post by Peter W. on Thu Sep 07, 2017 7:40 am

    Writing only for myself, I am a fan of the 5U4 as a simple means to de-rate (de-stress/increase tube life) for any amp using the 5AR4. In most (emphatically not all) cases, the listener will detect no difference for most signal played at reasonable volume. That they are readily available at a reasonable cost (so far) is also appealing.
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    Tubes4ever

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    Re: Rectifier tube list?

    Post by Tubes4ever on Fri Sep 08, 2017 8:30 pm

    Peter W. wrote:Writing only for myself, I am a fan of the 5U4 as a simple means to de-rate (de-stress/increase tube life) for any amp using the 5AR4. In most (emphatically not all) cases, the listener will detect no difference for most signal played at reasonable volume.  That they are readily available at a reasonable cost (so far) is also appealing.

    I second your opinion. Also, the 5U4GB is MUCH more reliable.
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    tubes4hifi
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    Re: Rectifier tube list?

    Post by tubes4hifi on Mon Sep 11, 2017 11:50 am

    Bob Latino has posted somewhere on this site a very comprehensive listing of tube rectifiers, use the search function (and hopefully it works) or maybe Bob will check this thread
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    Ernstmach

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    Re: Rectifier tube list?

    Post by Ernstmach on Mon Sep 11, 2017 3:37 pm

    "use the search function "
    I did try that with a couple of different search phrases but nothing came up.
    Thanks for the reminder though!
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    Bob Latino
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    Re: Rectifier tube list?

    Post by Bob Latino on Mon Sep 11, 2017 3:39 pm

    Below is the rectifier comparison chart that we had posted on an earlier post .. What happened was that it was posted on Photobucket. Earlier this year Photobucket killed all the posts I had up there ..

    Bob


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    Ernstmach

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    Re: Rectifier tube list?

    Post by Ernstmach on Mon Sep 11, 2017 9:12 pm

    Bob,
    thanks for posting that.
    The photobucket thing really messed things up!
    I have printed that and added it to my tube folder for future reference.
    Thanks for all of your effort.
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    Dave_in_Va

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    Re: Rectifier tube list?

    Post by Dave_in_Va on Mon Sep 11, 2017 10:59 pm

    Where would the GZ33 and GZ37 fit in there?
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    Dave_in_Va

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    Re: Rectifier tube list?

    Post by Dave_in_Va on Tue Sep 19, 2017 11:39 pm

    Does anyone know the equivelent to the GZ33 or GZ37??

    Just curious since I hear so much about them and they aren't really much more $ than nice GZ34s.
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    Tubes4ever

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    Re: Rectifier tube list?

    Post by Tubes4ever on Fri Sep 22, 2017 4:29 pm

    Dave_in_Va wrote:Does anyone know the equivelent to the GZ33 or GZ37??

    Just curious since I hear so much about them and they aren't really much more $ than nice GZ34s.

    I measured the voltage drop of a new GZ37 and it was close to what you get with a 5U4GB.
    You get the benefit of a slow startup and they seem to be much more reliable than a GZ34. Plus they look REALLY nice!
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    deepee99

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    Re: Rectifier tube list?

    Post by deepee99 on Sat Sep 23, 2017 12:39 pm

    Dave_in_Va wrote:Does anyone know the equivelent to the GZ33 or GZ37??

    Just curious since I hear so much about them and they aren't really much more $ than nice GZ34s.

    There is no equivalent to the old Mullard GZ-33s. They are tough birds. If you do Roy's "yellow-sheet" mod on the socket they'll outlive your grand-kids.


    Last edited by deepee99 on Sat Sep 23, 2017 2:29 pm; edited 1 time in total (Reason for editing : crappy diction)
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    Tubes4ever

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    Re: Rectifier tube list?

    Post by Tubes4ever on Fri Sep 29, 2017 11:07 pm

    Dave_in_Va wrote:Where would the GZ33 and GZ37 fit in there?

    I installed a NOS GZ33 today in my ST-70 and discovered that I didn't need to change the bias at all. I had been using a GZ34. It acted just like a GZ34 as far as voltage drop. As others have noted, it is apparently pretty much bullet proof. And much better looking!

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