Robrob Princeton Reverb Delete AA1164D build

[sds1]

Thanks. I wasn't sure if you could elevate like in a cathode bias amp (my first build was cathode bias).

You can, but you'll need to establish an appropriate DC reference voltage for elevation since there is no cathode bias voltage to use.

Rob recommends creating a voltage divider at B+, more info on this here:

Amp Mods

Generic Guitar Tube Amplifier Modifications

robrobinette.com

 

[Jason McG]

It’s the AA1164 circuit, minus trem and reverb, with 3 gain stages. Think the 6G2 has two. It’s super quiet with the reverb on a pedal instead of in the cab, and I really never use tremolo, so ideal for my needs.

Also, as a separate head, I use these squishy rubber feet to isolate the vibrations from the cab, they really work well to save your tubes and components from vibration damage.

 

[tomward]

It’s the AA1164 circuit, minus trem and reverb, with 3 gain stages. Think the 6G2 has two. It’s super quiet with the reverb on a pedal instead of in the cab, and I really never use tremolo, so ideal for my needs.

View attachment 948912
Also, as a separate head, I use these squishy rubber feet to isolate the vibrations from the cab, they really work well to save your tubes and components from vibration damage.
View attachment 948913

It’s the AA1164 circuit, minus trem and reverb, with 3 gain stages. Think the 6G2 has two. It’s super quiet with the reverb on a pedal instead of in the cab, and I really never use tremolo, so ideal for my needs.

View attachment 948912
Also, as a separate head, I use these squishy rubber feet to isolate the vibrations from the cab, they really work well to save your tubes and components from vibration damage.
View attachment 948913

Oh man thanks for posting this Jason.Your work is beautiful.I hope the tone is as great as you wanted.Is the wattage 2x12watts for a total of 24watts?

 

[Jason McG]

The feet nest perfectly in these jack plates, from CE Distribution (and it’s retailers)

 

[Jason McG]

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[Jason McG]

Oh man thanks for posting this Jason.Your work is beautiful.I hope the tone is as great as you wanted.Is the wattage 2x12watts for a total of 24watts?

thanks,

I think it is in the 12-15 watt range, very thrilled with the tone. Using the mid/raw pot, full up dials out the tone stack, so you can go full blackface, or full tweed, and everything in between.

 

[robrob]

Just ground the 6.3v center tap.

 

[DocEmmettBrown]

Awesome Info in this thread - Thanks!
Im looking to build the AA1164D but with a conventional SS rectifier. Any suggestions on a PT that would get me in the same B+ range as this or the 400ish on RobRobs layout? I really like the vertical mount PT as the chassis I'm working with is only 8"x6" - hence the reason for SS instead of another tube.

 

[Jesco]

Awesome Info in this thread - Thanks!
Im looking to build the AA1164D but with a conventional SS rectifier. Any suggestions on a PT that would get me in the same B+ range as this or the 400ish on RobRobs layout? I really like the vertical mount PT as the chassis I'm working with is only 8"x6" - hence the reason for SS instead of another tube.

The Hammond 290AX should do the job. It is the same transformer recommended by Rob, but it has 550v and 650v windings and is 100ma. If you use the 550v winding with a solid state rectifier your B+ should about 385vdc (275vac x 1.4). The 290HAX 550v/100ma may be better. It will also give you 385vdc, but also has a 50v bias winding to power the fixed bias circuit. A 290MAZ with 600v/100ma would give you 420vdc (Rob’s documented B+ target).