Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Leevi on October 31, 2020, 05:28:20 am

Title: 5A3 preamp tube
Post by: Leevi on October 31, 2020, 05:28:20 am

I'm going to build a Deluxe 5A3 based amp and have thought replace the 1'st preamp tube 6SC7 and PI with 6SL7s.
The specifications of those tubes are very similar, the biggest differences are on cathode and pin order.
I have even seen some schematic versions where the PI is replaced with 6SL7.

https://el34world.com/charts/Schematics/files/Fender/Fender_deluxe_5a3_schem.pdf

6SL7 is better available.


Do you think those replacements especially the 1'st tube will work fine?


/Leevi

Title: Re: 5A3 preamp tube
Post by: DummyLoad on October 31, 2020, 05:35:02 am

shouldn't be any issues. IMO some of the 6SL7GT sound better than the 6SC7. 


--pete

Title: Re: 5A3 preamp tube
Post by: bmccowan on October 31, 2020, 03:51:43 pm

I built a 5C3 with 6SL7s. worked out fine. It started out with grid leak bias, but after a while I changed the preamp to cathode bias. Both sounded good.