Hello,
We can see in the Tube Town website the following specs for the 5e3 style power transformer:
5E3 Powertransformer , laydown (tt-5e3-vpo)
Pri.: 0-230V-240V (50Hz)
Sec.1: 320-CT-320 V @ 85 mA DC
Sec.2: 6,3V C.T. @ 2,5A
Sec.3: 0-5V @ 2A
5E3 Powertransformer , vertical mount (tt-5e3-pw)
Pri.: 0-120V / 0-110V-120V @ 50Hz
Sec.1: 320-CT-320 V @ 85 mA DC
Sec.2: 6,3V C.T. @ 3,5A
Sec.3: 0-5V @ 3A
Looking at LX18 schematic using 5e3 vertical mount transformer the HT rectified put out over 420V on the 6v6s (jj) plates biased at 50mV.
I have a recent built amp with 2x6v6s (jj). Using the 5e3 laydown power transformer, I can get only 390V at plates biased at 43mv. If I try set the bias hotter the Voltage goes down.
Math says that a 320-0-320 HT power transformer would put under normal load about 320x1,32= 422V (that is confirmed in LX18 schematic), and the answer is:
Why I can get only 390V out of the laydown version if the HTs specs are the same?.
I wanted to build a BrownFace deluxe, but the final voltage is a bit low for my target.
P.D. It´s true that sec2 and sec3 can put out more current in the vertical mount version, but it should not affect the HTs taps.
Best Regards.
