What's the best 417A & 437A? - diyAudio
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Old 23rd January 2007, 02:27 AM   #1
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Default What"s the best 417A&437A

Am looking for a driver stage to push my 300B se amp,which one is the best driver to drive my 300B via NC-20F interstage!!!
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Triod Lover.
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Old 23rd January 2007, 02:48 AM   #2
arnoldc is offline arnoldc  Philippines
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Do you mean differences between 417A variants?

I have Raytheon 5842, Amperex gold pins 5842 and Western Electric 417A. Price no object, I like the Amperex on my 45 amp better than the two others, which are very good in their own right.

I do not own a 437A (how I wish)
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Old 23rd January 2007, 03:06 AM   #3
CLS is offline CLS  Taiwan
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As to 437A, how about 6S45 (6C45) instead? It's much easier to get & much much much cheaper.

It's choke loaded & driving my 300B, working very well.
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Old 23rd January 2007, 02:11 PM   #4
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Or, a triode-wired E810F/7788. Comparable in mu and gm to the 437A and 6C45, if not a tad more of each parameter. The 7721/D3a has a higher mu, but belongs in this "super tube" category too.

Also, although paralleling tubes has its own set of problems (and detractors) , two 417A/5842s in parallel is close to a 437A, at least in terms of specsmanship. Might be worth a try if you can achieve good current balance with two matched tubes.
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