CV315/4304CB/VT62 - RAF Transmitter

If they glow, this is the place to be
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nic
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#16

Post by nic »

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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#17

Post by Cressy Snr »

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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#18

Post by nic »

The cathode follower is a 7236

cheers

Nic
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nic
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#19

Post by nic »

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

cheers

Nic
bonzo75
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#20 Re: CV315/4304CB/VT62 - RAF Transmitter

Post by bonzo75 »

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
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#21 Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Max N »

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

Post by Max N »

If I right click and 'open image in new tab' I get
Http/1.1 Service Unavailable
Ant
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#23 Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Ant »

They were probably hosted on an ancient mac. Com server that is no longer there
Also starring Rex Hamilton as Abraham Lincoln

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

Post by Max N »

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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#25 Re: CV315/4304CB/VT62 - RAF Transmitter

Post by Max N »

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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#26 Re: CV315/4304CB/VT62 - RAF Transmitter

Post by pre65 »

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

PT15 push pull anyone ? :lol:
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