carlos2007 wrote:

Would you swap a Drake r8b for a Collins 51 S1? Why do I ask this?

I have a Drake R8B and a Wellbrook 1530+ antenna, and pick up a lot
ot QRM and noise S5 - 6 so I cannot do DX, I have tried with other
antennas and the result is the same.

So, get an AM radio with a loopstick antenna, walk around the neighborhood,
and see where the QRM is coming from. Then fix it.

I have read in other forums that receivers with valvel are less noiser
and one owner of the Collins 51 s1 says that QRM and noises do not
exist.

He doesn't have a touch lamp. If he had a touch lamp, he wouldn't be able
to use his radio at all.

It's true that radios with good filters and lots of dynamic range on the
front end are better at dealing with QRM, but if you have an issue that is
severe, you need to find it and fix it.

Do you think that it is worth swapping it?

No, because it doesn't solve the problem.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."