Known designs with 1st stage LNFB?
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Tony Bones
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Re: Known designs with 1st stage LNFB?
If you need to knock the gain down more, you could split the plate resistor into two series resistors and take the output off the junction. Fender did that with the second stage of the 6G3 Deluxe.
Re: Known designs with 1st stage LNFB?
Deleted
Tube junkie that aspires to become a tri-state bidirectional buss driver.
Re: Known designs with 1st stage LNFB?
Another Guild amp with LNFB at V1
(Edit: AKA virtual earth mixer in this amp)
(Edit: AKA virtual earth mixer in this amp)
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Last edited by tubeswell on Wed Feb 06, 2019 3:35 am, edited 1 time in total.
He who dies with the most tubes... wins
Re: Known designs with 1st stage LNFB?
Dano DM25
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He who dies with the most tubes... wins
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Reeltarded
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Re: Known designs with 1st stage LNFB?
I tried several things and none got near what I really wanted so I reverted back to similar place where I started.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
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Tony Bones
- Posts: 228
- Joined: Thu Oct 30, 2014 8:24 pm
Re: Known designs with 1st stage LNFB?
Not only does it have LNFB around V1, but there is a NFB loop from the plate of the 4th stage to the cathode of the third stage. It's the same idea as in the Thunderbird that I showed, but without the switch complicating things.
Re: Known designs with 1st stage LNFB?
You can add a potentiometer in series with by cathode bypassing cap and set the amount of degenerative feedback you want.
Based on standard Rk values, 25k log would be perfect imho for this application.
Based on standard Rk values, 25k log would be perfect imho for this application.