The SUNN 300T Retube Kits.
All of our SUNN 300T full Retube Kits are designed specifically for these amps. Every kit is configured to provide a specific sound/experience.
The default power tubes for all of our SUNN 300T kits are the JJ KT88’s. The JJ KT88’s are a higher power tube with lots of headroom, thunderous lows and thick/aggressive mids. However you can use the dropdown to select the JJ 6550’s. The JJ 6550 is a high power tube with more headroom than your standard EL34 or 6L6 variant. Compared to the KT88, it breaks up a little earlier and has very raw and open overdriven sound.
These amps are adjustable bias with LED indicators so all that is required is a screwdriver.
The Standard Retube Kit is very close to OEM. The kit includes one matched sextet of JJ KT88’s by default, one Balanced JJ ECC81 for V4 (see tube chart below) and three Standard JJ ECC83S’s for V1 – V2 – V3.
The High Gain Retube Kit uses our hand picked high gain selected JJ ECC83S’s. If you’re looking for maximum punch and growl this is where you want to be. Sonically this setup is very similar to our Standard Retube Kit but with a little extra gain on tap. The kit includes one matched sextet of JJ KT88’s by default one Balanced JJ ECC81 for V4 (see tube chart below) and three Standard Handpicked High Gain JJ ECC83S’s for V1 – V2 – V3.
The ECC803S Option Retube Kit uses the Long Plate JJ ECC803S in the Preamp section. The JJ Long Plate ECC803S has a little lower gain with big thick mids and a little more sparkle in the highs. The kit includes one matched sextet of JJ KT88’s by default, one Balanced JJ ECC81 for V4 (see tube chart below) and three Standard Long Plate JJ ECC803S’s for V1 – V2 – V3.


