[Amps] Recommended 3-500's

[Joe Isabella]

The "blue" tube has lost vacuum.

I'd replace both of them with matched RFP 3-500ZGs.  I use them in my 3K-A (quite similar to the Classic-X), and a buddy of mine with a Classic-X used them as well.  The fit just fine, and you'll get lots of power out of them in that amp (over 2kW with enough drive).  Hard to beat 2kW+ out for $300 (unless you go Russian, maybe).

Joe, N3JI

----- Original Message ----
From: Martin Sole <msole at loxinfo.co.th>
To: amps at contesting.com
Sent: Sunday, July 23, 2006 12:38:25 AM
Subject: [Amps] Recommended 3-500's

The Henry 2K Classic X heavy duty is now useable it seems. It is going 
to need a complete strip down and cleaning, a sort of mini restoration 
but it does look as if it is going to be a very nice amplifier when 
sorted. Of the two tubes that came with it one is known to be bad. A 
little drive causes it to light up like an ultra violet neon tube with a 
resounding 'pop' this happens easier at the higher anode voltage and is 
generally followed by a series of louder pops and a big 'bang'. I 
presume this is a tube fit for nothing other than looking at and as a 
result I want to consider how I might best replace it.

The bad tube is an Eimac 3-500Z date code 8849. The good one is also an 
Eimac 3-500Z date code 8611.

Should I consider a single tube or only a matched pair?

Is there a preferred supplier? RFP seems to get good reviews.

Will anybodies tubes fit inside the glass chimneys?

Thanks

Martin HS0ZED

_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps