tubeswell
Joined: Sep 24, 2011
Posts: 1424
Wellington, NZ
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Posted on Jun 18 2012 10:28 AM
The reflected load for a tube is a matter of being in the 'ballpark'. The GE 6K6 tube datasheet specifies 7k6 load at 250V on the plate and 9k at 315V. But anywhere between 5k-12k will work, with 7k-8k5 being more 'optimal'. Similar with a 6V6.
— He who dies with the most tubes... wins
Surf Daddies
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busse
Joined: Jun 17, 2012
Posts: 13
Sweden
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Posted on Jun 22 2012 02:13 AM
What's the tonal difference on the reverb if you use a 6K6 or a 6V6 output tube?
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irv78
Joined: Jun 26, 2009
Posts: 99
Austria
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Posted on Jun 22 2012 07:53 AM
busse wrote:
What's the tonal difference on the reverb if you use a 6K6 or a 6V6 output tube?
The 6K6 tube has less power than a 6V6 and will sound less agressive/harsh. 6K6 tubes are still readily available and fairly cheap to get on ebay.
Just try both and see what you prefer - I'm definitely in the 6K6 camp.
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tubeswell
Joined: Sep 24, 2011
Posts: 1424
Wellington, NZ
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Posted on Jun 22 2012 01:37 PM
The 6K6 has a lower transconductance than a 6V6 (which means that the plate-current swing is lower for a given grid-voltage swing). This makes the 6K6 less prone to clipping. (Good reverb is all about keeping the signal as clean as possible)
A 6K6 also runs closer to optimal bias in the 6G15 circuit. The reverb driver output tube's cathode resistor is 1k, which makes the 6V6 run cold.
— He who dies with the most tubes... wins
Surf Daddies
Last edited: Jun 22, 2012 13:40:50
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