Some may ask if the Frog Fx1 Tube Preamp for guitar and bass guitar is a clone of the venerable Alembic F2b tube preamp. The answer is, yes, no, or maybe. Here is a little history of the tube preamp circuit that is used in the Alembic F2b tube preamp and the Frog Fx1 tube preamp that may help you decide:
The basic circuit that both the Frog and Alembic use was originally found in the RCA receiving tube manual. When Leo Fender needed a circuit for his first amplifiers (the K&F model amps) in about 1948, he went to RCA receiving tube manual and found the basic requirements/schematics for building preamplifiers and amplifiers.
In the late 1960’s the circuit was incorporated into the Fender Dual Showman amplifier. In the early 1970’s the Grateful Dead were using Fender Dual Showman amps with the internal preamp output rewired to McIntosh power tube amplifiers courtesy of their primary PA provider, Alembic. They liked the preamp, but not the power amp of the Fender.
Because the Dual Showman was too big for a rack, they built a 19 inch rack mount tube preamp with 2 channels based on the Dual Showman amplifier. The Alembic F2b was born.
Jump ahead 40 years or so to 2015 and Mark Price decides he wants to experience the Alembic F2b magic and build one himself, because the Alembic F2b costs around $1,300.00USD. After 3 printed circuit board re-designs, I designed what became the Frog Tube Preamp PCB 2.0 and other DIY’ers became interested in building the tube preamp themselves. I have sent about 60 of the DIY PCBs around the world from the USA, Canada, almost every country in Europe as well as Austrailia and Japan. In 2016, I decided that there were probably a lot more people that would prefer to purchase a completed tube preamp than make one themselves, so I began to make prototypes of what would be my first complete single channel tube preamp for sale, the Fx1. I designed it to fit on your pedal board and runs off of a 9VDC wall transformer while maintaining 200vdc voltages for the tube. The Frog Fx1 started selling in February of 2017. If I would have known, I could have saved a lot of money by just purchasing a brand new Alembic F2b, because the development and FCC certifications cost for the Frog Fx1 was a lot more than the $1,300.00USD for the Alembic! Thats ok, it has been fun and the Fx1 is starting to catch on. So far I have sold completed preamps in the USA, Canada and Germany.
Now, at the current price you can experience the “Alembic F2b sound” that is so popular for less than 1/3 of the Alembic F2b cost. I am now developing a more ruggedized version of the same preamp that has the tube protected inside the pedal enclosure. Check on Facebook @ frogpedals for ongoing updates of all of Frogpedals developments.
There are a few differences or shall I say updates for the better, so here is a list of features of the 3 products:
Features Fender Alembic Frog Fx1 All tube circuit Yes Yes Yes Bright Switch Yes Yes Yes Mid Boost Switch No No Yes Diode Clipping No No Yes Dual Channel Yes Yes No Grid leak protection No No Yes Master Volume No No Yes 6 and 12 volt tubes No No Yes Class A tube operation Yes Yes Yes Power amp output Yes No No Cost ouch ouch ahhhh
Some future Frog plans:
- Ruggedized version with internal tube, true bypass stomp and master volume sized for pedalboard
- Ruggedized version with internal tube, true bypass stomp and master volume sized for pedalboard with 1/4 inch and DI XLR output
- Dual Channel pedalboard sized
- Dual Channel rack mounted with 1/4 inch outputs and DI XLR outputs
- Stand-alone High Quality DI unit
Note: DI will be a high quality Jensen, OEP, Cinemag or Crimson Audio transformers, your choice!
So is the Frog Fx1 a clone? I would say no. I would call it a natural progression of a great idea started when Leo Fender first picked up that RCA Receiving tubes manual.
What do you think? Feel free to leave comments below. Thank you!