OK. That's very encouraging. You could be right, as we had no
other 1500B tubes to compare it with.
Thanks, Alek.
On 28/11/2023 1:24 am, W7WRX wrote:
toggle quoted message
Show quoted text
You had a weak 1500B.? Its a far better tube and for sure will
make more power.? I have swapped these many times.
C
Rudi was clever. He had the socket centre pin modified to
take the Eimac tubes and put a 6V tap on the transformer in
the DX-2SP amplifier. I have tried both the 4CX1500B and the
4CX1000A in a friend's amp and the 4CX1000A is the much better
choice. The output with the 4CX1500B installed was quite a bit
lower.
73, Alek VK6APK
On 26/11/2023 8:00 pm, Louis
Parascondola via groups.io wrote:
If an amp uses FU728 by design and has
an actual 728 socket stem, a 4cx1000 will not just fit in. The
center shaft is too wide in diameter. ?It may be possible to
enlarge the center hole on the 4cx1000 with the right size
drill bit to make it fit. ?The FU728 with a larger hole will
fit a real 4cx1000 socket without an issue. ?Change filament
voltage of course either way..
On Sunday, November 26, 2023, 6:49 AM, Adrian Fewster
<vk4tux@...> wrote:
Alek, see?
Can dropin for a FU-728 with filament voltage changed to
6v ..
73
vk4tux
