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16th May 2012, 11:38 AM
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#101 |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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even your big tube spacings are too close for comfort, at least one and a half tube diameter apart for the power tubes...
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16th May 2012, 11:38 AM
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#102 |
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diyAudio Moderator
Join Date: May 2003
Location: Palatiw, Pasig City
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fans can be deployed under the power tube sockets to cool the tubes.....
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16th May 2012, 11:45 AM
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#103 |
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Account disabled at member's request
Join Date: Jul 2009
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That is where i intended to place them. 4 12v fans with a series parallel switch for silent or power use. I guess i was unclear. The sockets thmselves will be 20mm elevated from the chassis with brass spacers. Thanks for the observations!
Inviato dal mio GT-I9001 con Tapatalk 2 |
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16th May 2012, 11:55 AM
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#104 |
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diyAudio Member
Join Date: Jan 2007
Location: Minnesota
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Compared to premature failure of various components due to a cramped layout I would think reworking the chassis would actually be a pretty cheap fix in comparison to replacing one of those valves.
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- Nic |
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16th May 2012, 12:21 PM
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#105 | |
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diyAudio Member
Join Date: Jan 2003
Location: England
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Quote:
It was only the other day that I was shocked by how hot a finned aluminium heatsink (about four inches square) became just absorbing the heat from four TO220 devices dissipating a few watts each! Here we are talking of four valves whose filaments require about 480W in total and with anodes dissipating what? At just 1kV and 300mA each we're looking ata substantial electric fire aren't we?
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Plug them in and light them up |
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16th May 2012, 12:25 PM
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#106 | |
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diyAudio Member
Join Date: Apr 2008
Location: Annecy/FRANCE
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Quote:
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François. |
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16th May 2012, 01:49 PM
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#107 |
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Account disabled at member's request
Join Date: Jul 2009
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I have 8 gu81m and can source more @ 24euros each.
I think some forced air cooling will have to be installed. Maybe some thin 20mm fan... Will have to look into it. Inviato dal mio GT-I9001 con Tapatalk 2 |
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16th May 2012, 04:36 PM
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#108 |
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diyAudio Member
Join Date: Oct 2003
Location: Sydney
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Do you own the book 'Building Valve Amplifiers'? It talks about the exact things you are asking about. As others are stating, you have a massive amount of radiated heat to deal with. Fans are not going to stop the large amount of radiated energy from one anode being absorbed by the anode next to it. As well as spacing, you need to consider orientation. The 'flat' face of the anode is going to radiate (and absorb) more heat than the narrow face. You should therefore have the anodes facing away from each other, such that one anode's radiated heat is not absorbed by its neighbour.
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16th May 2012, 04:47 PM
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#109 |
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Account disabled at member's request
Join Date: Jul 2009
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No i must buy it
 Inviato dal mio GT-I9001 con Tapatalk 2 |
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16th May 2012, 04:49 PM
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#110 | |
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diyAudio Member
Join Date: Jan 2003
Location: England
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And another thing...
Quote:
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