CV315/4304CB/VT62 - RAF Transmitter

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nic
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Post by nic » Thu Mar 18, 2010 11:32 pm

A nice find ! Make sure you find the grid and anode dissipator caps before doing anything ! I've done an amp with 834 which is the same as 4304 but has a large chunk of graphite as an anode . This ran in zero bias (grid at 0V) . Running at 65mA with James 6123HS on the 5k tap driven by a choke-loaded cathode follower driver , a good few watts is achievable . In this configuration a low impedence driver with plenty of current on tap is required . Never used these in A2 but would expect damping factor may be an issue as inevitably your Rload will be lower than your Ra . If you are lucky enough to afford them , Dave Slagle can provide a 15K SE OPTX with offset cancellation winding . Then you can run these in A1 :)

cheers

Nic
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Cressy Snr
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Post by Cressy Snr » Fri Mar 19, 2010 5:16 pm

Cheers Nic

Is that a 6080 you've got running as a cathode follower there?
That's what I was thinking of doing myself.

Steve
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nic
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Post by nic » Fri Mar 19, 2010 6:11 pm

The cathode follower is a 7236

cheers

Nic

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nic
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Post by nic » Fri Mar 19, 2010 6:18 pm

Opps , not a 7236 , a 6BX7 is in the picture although I did use 7236 later on

cheers

Nic

bonzo75
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Re: CV315/4304CB/VT62 - RAF Transmitter

Post by bonzo75 » Tue Apr 07, 2020 2:41 pm

Hi, I am interested in this tube. Does anyone have a pair for sale?

What tube are you guys using to drive an amp with the 4304

Max N
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Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Max N » Wed Apr 08, 2020 12:39 pm

Anyone else having trouble seeing some of the pics in this thread? For instance the pics in Steve's 1st & 3rd posts?
The rest of the forum all seems ok...
Maybe I need to flush a cache or something....

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Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Max N » Wed Apr 08, 2020 12:41 pm

If I right click and 'open image in new tab' I get
Http/1.1 Service Unavailable

Ant
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Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Ant » Wed Apr 08, 2020 12:53 pm

They were probably hosted on an ancient mac. Com server that is no longer there
Hey, wait, I got a new complaint
Forever in debt to your priceless advice

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Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Max N » Wed Apr 08, 2020 12:55 pm

Interesting thread, plus I think my Dad would have worked with these during his national service, so a bit of nostalgia value :)

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Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Max N » Wed Apr 08, 2020 12:55 pm

Ant wrote:
Wed Apr 08, 2020 12:53 pm
They were probably hosted on an ancient mac. Com server that is no longer there
OK, thanks Ant

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pre65
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Re: CV315/4304CB/VT62 - RAF Transmitter

Post by pre65 » Wed Apr 08, 2020 1:08 pm

I've got 4 of VT104 10E/215 (PT15) New Old Stock valves in war department boxes.

PT15 push pull anyone ? :lol:
Life is what happens to you while you're busy making other plans. John Lennon

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