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Old 23rd June 2011, 12:14 PM   #11
M Gregg is offline M Gregg  United Kingdom
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Just for interest!

Take a look at this link:

http://tubecad.com/2009/03/13/Aikido...20in%20One.pdf

Page 6 & 7 of the PDF. Page 7 is more interesting linked to the elevated cathode voltage.


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M. Gregg
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Last edited by M Gregg; 23rd June 2011 at 12:17 PM.
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Old 23rd June 2011, 01:58 PM   #12
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The glassware comment re using a capacitor float relates to the DC fed heater configuration.

Using an AC fed heater config will typically cause an increased hum level over DC fed - whether it is noticable or not is another issue.

In the best situation, I guess different heater windings could be used for high-side and low-side valves.
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Old 23rd June 2011, 04:13 PM   #13
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by trobbins View Post
The glassware comment re using a capacitor float relates to the DC fed heater configuration.

Using an AC fed heater config will typically cause an increased hum level over DC fed - whether it is noticable or not is another issue.

In the best situation, I guess different heater windings could be used for high-side and low-side valves.
Agreed,

Two separate windings sounds like a good idea!
I must admit I have used the glassware idea on my Aikido and it works well!

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Old 23rd June 2011, 09:46 PM   #14
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I notice that 'top and bottom' triodes are usually wired from the same 12A?7 type valve - for simple convenience - whereas say using one valve for 'bottom-bottom' triodes, and the top-top triodes in another valve would be a little tougher for wiring, and possibly less physical separation of amplified signal wires.

Like with a capacitor bypassed divider for the elevated DC bias of the heaters, using just a capacitor for floating would appear to give some benefit from bypassing audio signal leakage through to the heater from the cathode.

Heaters are certainly getting more attention nowadays, as the noise floor and other hum contributions have dropped over the decades.
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