Hi !
The 1.5K 2W on power tube Pin 5, is they have to be right on the socket or can be under the board ?
or ... Why not using 221.5k 2k resistor to join pin 5 and board ?
Thanks
Express 1.5K pin 5
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- martin manning
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Re: Express 1.5K pin 5
Grid stopper resistors are always best placed on the sockets. That is where they are most effective at preventing oscillations.
Re: Express 1.5K pin 5
Sage advice from Martin. The Express circuit is on the edge of stability as is.
Why Aye Man
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Re: Express 1.5K pin 5
Another concideration with any build or in making a production amp better is the lenght of the overall distance the signal travels from the plates of the PI section to the grids of the output tubes.
Sometimes anything over 2.5" is asking for a osscilation issue, or instability if the amp uses a feedback circuit.
Sometimes anything over 2.5" is asking for a osscilation issue, or instability if the amp uses a feedback circuit.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!