I will qualify that.
200W, on 40 & 80, into a dummy load.
180W on 20
150+ on 15 & 10.
Yes, 100W is low, especially with replaced tubes -- though 8 years is enough time to wear them out if proper precautions aren't taken.
The primary destroyer of the final tubes is driving the carp out of them all the time.? Abide by the manual's maximum plate (cathode) current recommendations, which are 300W PEP ? INPUT** on SSB and 260W INPUT?? on CW.? Given that the amp is biased AB1, assume 60% efficiency.? 260 * .6 = 156 W output.
Of course, nearly everyone runs more than that but that's what the official recommendation from Drake is and wouldn't change due to the 1kW input max vs 1500W output max that changed 40+ years ago.
FWIW
73,
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Thursday, November 30th, 2023 at 4:04 PM, Joe WB9SBD <nss@...> wrote:
100 watts is not right.
Every TR-4 I have ever had and used has made close to 200 watts CW
OUT. some even a bit more.
100 watts and something isn't right.
Joe WB9SBD
On 11/30/2023 1:50 PM, Tom Hellem
wrote:
[Edited Message Follows]
I have spent some more time on this project since I last
posted. The audio hum I mentioned before seems to have resolved
itself
as it is no longer noticeable. I guess the caps just needed more
time to come back to life.
Power output is 100 watts on 80-10. . Completely re-tubed,
including finals, in 2016, have invoice from RF Parts, will
share.
Not many hours since. Underside of chassis looks shiny and
bright, like new. Top side has a few of the blotches.
$200 plus ship. PayPal F&F, Venmo OK. More pix
available. Ships from Missoula, MT 59801. I also have an AC-4
and MS-4 which I will
post on another message . If you think my price is not
reasonable, I am open to suggestions. See other messages in this
thread for more pix.
Tom Hellem, K0SN tel. 406-two four zero-five four two eight
tom.hellem@...
