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bass amp 6DQ6B PP
Hello everybody. I’m putting together a tube amp for electric bass.
While I used the playmaster 117 as a base, I made quite a few changes to be able to experiment with valves that I have on hand.
In the first circuit I used a 6SQ7, which turned out to be excellent in that place, a very quiet triode. and I put together an active Baxandal with the pentode of a 6U8A. The triode of the 6U8 was like cathodin to push the 6DQ6B. After having assembled 6 or 7 tube amps, this one really surprised me. It is a very great power. Although measuring at 1KhZ continuous sine wave gives around 70W into 8 ohms, it sounds on par with my other 400W Gallien Krueger amp.
I used the cabinet and many of the components of a Panadaptor radio spectrum analyzer and after using it for about a week when connecting an overdrive pedal I saw that the volume turned up much more before saturating, which made it clear that it was missing one. amplification stage.
In this second circuit I added the triode section of an ECF80 behind the 6SQ7, as you will see in the second diagram.
According to the ECF80 datasheet, I should use the triode at about 14mA to work on the linear part of the curve, but I decided to make it work by stepping on the non-linear part to see if it would gain some more harmonics.
It currently works at about 9 mA when idle.
I would like you to make criticisms and recommendations regarding this.
Thanks.
While I used the playmaster 117 as a base, I made quite a few changes to be able to experiment with valves that I have on hand.
In the first circuit I used a 6SQ7, which turned out to be excellent in that place, a very quiet triode. and I put together an active Baxandal with the pentode of a 6U8A. The triode of the 6U8 was like cathodin to push the 6DQ6B. After having assembled 6 or 7 tube amps, this one really surprised me. It is a very great power. Although measuring at 1KhZ continuous sine wave gives around 70W into 8 ohms, it sounds on par with my other 400W Gallien Krueger amp.
I used the cabinet and many of the components of a Panadaptor radio spectrum analyzer and after using it for about a week when connecting an overdrive pedal I saw that the volume turned up much more before saturating, which made it clear that it was missing one. amplification stage.
In this second circuit I added the triode section of an ECF80 behind the 6SQ7, as you will see in the second diagram.
According to the ECF80 datasheet, I should use the triode at about 14mA to work on the linear part of the curve, but I decided to make it work by stepping on the non-linear part to see if it would gain some more harmonics.
It currently works at about 9 mA when idle.
I would like you to make criticisms and recommendations regarding this.
Thanks.
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