Battery Sale!

[corndog71]

... soon or later becomes tired to feed it with batteries and go searching another good sounding cheap tube preamp ?

Feeding with batteries is not an issue, but actually a design plus.  I moved from 4 9v batteries to 3 12v SLA batteries.  I keep the 12v batteries at full charge, when not playing), with an inexpensive float charger. The only hassle is just charging 1 battery at a time.  I will  likely change the D cells to rechargeable's in the near future.

Another good sounding cheap tube preamp is an oxymoron. To get "cheap", it is usually the critical power supply where cost and quality are cut.

Cheers,
Geary

Same here.  I only have to charge my 12V batteries once a year.  I've been wanting rechargeable D cells for a while but the good ones (11,000mAH!) are $30 a pair!  It's hard to cough up that much coin but I'll probably do it sometime soon.  A decent D cell charger is kinda pricey too.  Although I just saw at Costco a pack of 14 D cells for $20.

 

[Paul Joppa]

If you don't mind changing batteries more often (10 hours instead of 100 hours) then you can use AA for the filaments. Might be cheaper when using rechargeables.

I'd worry a little about possible RF interference, but it might be fun to experiment with a solar charger permanently wired to the filament cell. I think solar AA chargers are readily available.

 

[Chris]

Solar would be an excellent idea... Bottlehead goes GREEN!!!.....

 

[charger]

that's a good idea!!!

 

[Doc B]

I'd worry a little about possible RF interference

and solar flares...

 

[charger]

in Italy there is plenty of Sun