Firebottle Kt88 tube rolling

[Isaacc7]

Originally Posted by Huduguru

@Isaacc7 : I am beginning to roll tubes in a June 2021-production Firebottle amp w/volume control, and am curious about your experience with 807/5933 power tubes and associated rectifiers. How does the 807 compare to say a kt88? I like the availability of the 807 and the quirkiness of it (adapter and top cap), but am curious about sound. I love more solid low end of the bigger tubes, but want to check out the 807 and any compatible retifier/input tube combo with it.

Sorry about the late reply... The 807 is a great tube! I enjoy a Russian pair I have. They are labeled Firenti but are Russian. I also have a set of 5933 that I have not tried yet but will one of these days.

The 807 is basically a 6l6 with a top cap. Using an adapter essentially gives you access to all the different brands 6l6/6l6gb tubes but cheaper. Another tube you might want to think about is the 6bg6. It too started out as a 6l6 with a top cap though with a different base. What's cool about the 6bg6 is that over time manufacturers ended up putting their newer versions of 6l6 in the 6bg6. GE ended up with 6l6gc guts in their last 6bg6ga. The Philips 6bg6ga actually had the same guts as a Sylvania 7027a! I've bought them for $15 NOS, not going to find 7027a at those prices...

So my suggestion is if you want to play with adapters, get a 6bg6. You'll be able to get the same tubes as the 807 plus some better ones too.