brians7 wrote:I like the idea. I must say that I love the RH84 amp that Tom built for me. How about a Chubby Clementine using 1625 and 12SL7? From what I read you either high mu, or high transconductance for amp works perfectly.
So do you think that the 12SL7 can push low impedance node through 1625 grid without distorting? Over my head for sure. Brian
The 1625 is an 807 with 12.6V heaters, basically.
This means that you can apply DIRECTLY the RH807 schematics to the 1625.
BUT, you will not be able to use the 12SL7 (or 6SL7) as driver, since it does not have enough transconductance.
On the other hand, the ECC81/12AT7 family can be heated with 12.6V, so there is nothing stopping you to build an RH807 with the 1625 (except the wish to use a 12SL7 at all cost
).
Not to mention the fact that you can switch the ECC81 for a 5965, or E180CC with very interesting results...