811A tubes in SB-200

[rayfri]

Typically you can use 529B's in place of 811s but not the other way
around.  The plate voltage
and current would "blow" the 811s to heck.  I had the same question you
did when I got my
sb 200 and had extra 811s in the shack.    The good thing about 529b
tubes is that in amps
that use four 811s, like the Collins 30L-1, you can replace the four 811
tubes with two
529b tubes...    The 529b tubes then just loaf along but put out the
same power as the four 811
tubes...
Ray  wa7itz


oh8jep wrote:

>Hello!
>
>Has anyone tried to use cheap 811A tubes in Heathkit
>SB-200? Is that SB-200's plate voltage 2250V too high for
>811A ?
>
>Any info appreciated..
>
>Best 73's
>
>Aatos OH8JEP
>
>Ps. Thousand  thanks for all the good numerous advises and instructions which I have received from list members
>for my last time questions.!!
>
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