I'm gonna build 38 RAT pedals..

[Markus Kersius]

Got a bunch of stuff from a old radio/tv repairman retiring.
Lots of silicon transistors and diodes and some germanium as well.
But also some IC's
Notably..metal can LM308H's!
38 of 'm to be precise.
Look like National Semiconductor brand.
Are these the "mojo" ones for a RAT?
Most have same letter font printed, some have a bigger font.
See pictures.

 

[jesuscrisp]

I have mixed experience with metal can LM308s. The H variants I had were just almost unusably fuzzy. AH ones were the best LM308s I have had in Rats.

 

[jimilee]

Hell yeah!!!

 

[Giorfida]

Got a bunch of stuff from a old radio/tv repairman retiring.
Lots of silicon transistors and diodes and some germanium as well.
But also some IC's
Notably..metal can LM308H's!
38 of 'm to be precise.
Look like National Semiconductor brand.
Are these the "mojo" ones for a RAT?
Most have same letter font printed, some have a bigger font.
See pictures.

View attachment 68336View attachment 68337View attachment 68338View attachment 68339View attachment 68340

And run them all in series, maxed out!

 

[Bricksnbeatles]

And run them all in series, maxed out!

Or in parallel, each with the tone knob in a slightly different position

 

[Markus Kersius]

I have mixed experience with metal can LM308s. The H variants I had were just almost unusably fuzzy. AH ones were the best LM308s I have had in Rats.

Were these also the National Semiconductor brand?

 

[jesuscrisp]

Were these also the National Semiconductor brand?

Yes. You better also get some OP07s to compare to.

 

[KR Sound]

 

[Markus Kersius]

Yes. You better also get some OP07s to compare to.

I had build a Pandora's Box with OP07 in it which I unfortunately no longer have.
So can't compare.
What are the differences between the "AH" / "H" / "N" and other designations on the 308's?

 

[Markus Kersius]

View attachment 68380

I'm gonna put them all in 1 enclosure..

 

[Feral Feline]

So... 38 all the same (selling/gifting some),
or are you going to build a variety of Rat variants?

ProCo's own variants such as Turbo, Fat, Deucetone, etc...​

Idiot Box Blower Box​

Dunwich Volt Thrower​

Rous​

Reutze-modded​

Tranter-modded​

Caroline Wave Cannon​

VFE Alpha Dog​

etcetera...​

Not to mention, but doing so anyway...

Bixonic Expandora​

Drolo Giant Hogweed​

Roger Mayer Mongoose​

Roger Mayer Voodoo Bass​

Roger Mayer Voodoo — w/ Chuck D. Bones mods​

Roger Mayer Voodoo​

and...?​

 

[benny_profane]

Package suffixes:
N: Plastic DIP-8 package
H: Metal can (TO-99) package
J: Ceramic DIP-8 package
M: SOIC package

NatSemi documentation says that the ‘A’ represents an electrical grade—typically an improved process, die rev, performance bucket, etc. Referencing datasheets with both -A and non-A devices, the -A devices have slightly improved input offset voltage, large signal voltage gain, CMRR, and PSRR specs.

Part numbers:
The LM108 is guaranteed from -55°C to + 125°C, the LM208 from - 25°C to + 85°C, and the LM308 from 0°C to + 70°C. Note there are also differences with supply voltages, etc. between the different part numbers, but temperature is the big one.

 

[Markus Kersius]

So... 38 all the same (selling/gifting some),
or are you going to build a variety of Rat variants?

ProCo's own variants such as Turbo, Fat, Deucetone, etc...​

Idiot Box Blower Box​

Dunwich Volt Thrower​

Rous​

Reutze-modded​

Tranter-modded​

Caroline Wave Cannon​

VFE Alpha Dog​

etcetera...​

Not to mention, but doing so anyway...

Bixonic Expandora​

Drolo Giant Hogweed​

Roger Mayer Mongoose​

Roger Mayer Voodoo Bass​

Roger Mayer Voodoo — w/ Chuck D. Bones mods​

Roger Mayer Voodoo​

and...?​

Title was exaggeration of course, but I'm indeed tempted to build a couple of variations on the RAT etc
Already build the expandora but no longer have it (Sold to a fan of those modern ZZ top tones)
I think I'll just start with the basic rat and take it from there with variations and different mods.

 

[Markus Kersius]

Package suffixes:
N: Plastic DIP-8 package
H: Metal can (TO-99) package
J: Ceramic DIP-8 package
M: SOIC package

NatSemi documentation says that the ‘A’ represents an electrical grade—typically an improved process, die rev, performance bucket, etc. Referencing datasheets with both -A and non-A devices, the -A devices have slightly improved input offset voltage, large signal voltage gain, CMRR, and PSRR specs.

Part numbers:
The LM108 is guaranteed from -55°C to + 125°C, the LM208 from - 25°C to + 85°C, and the LM308 from 0°C to + 70°C. Note there are also differences with supply voltages, etc. between the different part numbers, but temperature is the big one.

Thnx for your expertise!
Copy-pasted it in my archives