Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Tone Junkie on December 31, 2010, 01:29:17 am

Title: Tone stack losses with a cathode follower
Post by: Tone Junkie on December 31, 2010, 01:29:17 am

I was curious OK here is the thought does a typical TMB tonestack with a cathode follower would it be considered neutral or not adding any boost to circuit,. Adding a slight boost or still negative in gain on the circuit. Im talking a standard fender marshall type . Thanks Bill

Title: Re: Tone stack losses with a cathode follower
Post by: JayB on December 31, 2010, 12:29:13 pm

Quote from: Tone Junkie on December 31, 2010, 01:29:17 am

I was curious OK here is the thought does a typical TMB tonestack with a cathode follower would it be considered neutral or not adding any boost to circuit,. Adding a slight boost or still negative in gain on the circuit. Im talking a standard fender marshall type . Thanks Bill

Slight boost. I'd say about 3 to 5 decibels more. It's hard for me to hear a difference in perceived volume but I could hear that it's brighter. You get more treble, high mids.  A cathode follower has a lower output impedance that makes driving a load with out lose of highs better.

Title: Re: Tone stack losses with a cathode follower
Post by: jojokeo on December 31, 2010, 01:44:44 pm

It definitely adds a boost and when you put a cathode cap on it, it's enough to be used as a lead switch.

Title: Re: Tone stack losses with a cathode follower
Post by: phsyconoodler on December 31, 2010, 02:25:08 pm

What are you guys talking about?

Title: Re: Tone stack losses with a cathode follower
Post by: Tone Junkie on December 31, 2010, 07:53:56 pm

What type of cathode cap are you talking about I say schematics anyone. No just joking,
The reason i asked .I have let several of my friends use my TOS . They asked me Bill would you build us that with two clean channels. because they all use pedals for there overdrive. But they just wanted a standard TMB type tonestack. I dont know why the OD channel is killer but thats what they asked. So my question was really About that because I like the buttery smoothness of the clean channel with the added paralleled tube onto the second gain stage but if the TMB with cf was neutral i would leave it like that . But Tubnit also has it in the TOS light with just two gain stages and still gets the bloom so i could go either way. Better yet one the first way one the second way, one using fender tone stack values the other using marshall. Thanks Bill

Title: Re: Tone stack losses with a cathode follower
Post by: tubenit on January 01, 2011, 07:18:17 am

Something like this?

With respect, Tubenit

Title: Re: Tone stack losses with a cathode follower
Post by: tubenit on January 01, 2011, 07:40:21 am

OR ........ like this????   

Not sure if the Fenderish clean channel would work when switched to the Marshallish clean channel?

With respect, Tubenit

Title: Re: Tone stack losses with a cathode follower
Post by: Tone Junkie on January 02, 2011, 11:29:46 pm

Both look like killer idea,s Tubnit . Thanks Bill