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InvisibleRogues_Pierre
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Pentagrid mixers
    #5402254 - 03/15/06 06:44 AM (17 years, 10 months ago)

I read somewhere that a tuner with a pentagrid mixer produces less distortion compared to using a pentode mixer. Does anyone here have any experience with this? Some Espey AM/FM radios use pentagrid mixers as you can see from the schematic.




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OfflineSeussA
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Re: Pentagrid mixers [Re: Rogues_Pierre]
    #5402481 - 03/15/06 08:19 AM (17 years, 10 months ago)

When designing tube amps, I almost always use pentodes in triode connect, class A push-pull. However, the biggest source of distortion I have found is from switching power supplies rather than tube type or amplifier class. Linear power supplies are a must when it comes to clean signals with tubes.


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InvisibleRogues_Pierre
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Re: Pentagrid mixers [Re: Seuss]
    #5403202 - 03/15/06 12:21 PM (17 years, 10 months ago)

Quote:

Seuss said:
When designing tube amps, I almost always use pentodes in triode connect, class A push-pull. However, the biggest source of distortion I have found is from switching power supplies rather than tube type or amplifier class. Linear power supplies are a must when it comes to clean signals with tubes.




Have you ever tried pentodes arranged in an ultralinear (partial triode) design?

A lot of people have done their homework here:
http://www.diyaudio.com/forums/forumdisplay.php?s=&forumid=5


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OfflineSeussA
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Re: Pentagrid mixers [Re: Rogues_Pierre]
    #5407100 - 03/16/06 05:32 AM (17 years, 10 months ago)

> Have you ever tried pentodes arranged in an ultralinear (partial triode) design?

No... tube amp design was a hobby of mine in high school, and I really haven't played with it since. Back then, there was no web and I was using an acoustic coupler 300 baud modem. Pretty much everything I learned was from old RCA manuals. My last design used a bank of 6V6s and produced a very rich sound.


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