Hello everybody,
recently I have struck a good deal on Assemblage ST-40. After reducing the feedback and playing with input section tubes I would like to try different output tubes. Instead of EL34 I would like to put some KT88. Output transformer is rated for 40W and with triode strapping I think this will be ok. But the filament current on the power transformer is rated only at 7A. With the current configuration I am using arround 6.9 (4xEL34, ECC83 and 2xECC82). With KT88 in place it will go up 0.4Amps more, so in total 300mA more than the transformer rating. The maker of the transformers is Hammond and I heard that they spec their transformers very conservatively. So do you think it will be ok. I mostly used toroids up to now (tube newbie) and these are EI core ones. So will they buzz if the current is too much, get hotter or what?
Thank you in advance for help.
Pred
PS
I have EAR (tim paravicini) EL34 logo tubes in do somebody has an idea where the source the tubes from, except from their logo there is also G1LE1 on them.
recently I have struck a good deal on Assemblage ST-40. After reducing the feedback and playing with input section tubes I would like to try different output tubes. Instead of EL34 I would like to put some KT88. Output transformer is rated for 40W and with triode strapping I think this will be ok. But the filament current on the power transformer is rated only at 7A. With the current configuration I am using arround 6.9 (4xEL34, ECC83 and 2xECC82). With KT88 in place it will go up 0.4Amps more, so in total 300mA more than the transformer rating. The maker of the transformers is Hammond and I heard that they spec their transformers very conservatively. So do you think it will be ok. I mostly used toroids up to now (tube newbie) and these are EI core ones. So will they buzz if the current is too much, get hotter or what?
Thank you in advance for help.
Pred
PS
I have EAR (tim paravicini) EL34 logo tubes in do somebody has an idea where the source the tubes from, except from their logo there is also G1LE1 on them.