audio-talk

Hi Paul
I have lost track slightly, but if you are now looking at 2A3/6B4G -> IT -> 300B, then don't forget the gain of the 2A3.

To drive the 300b, I think you only need about +/- 20V at the grid of the 2A3.
Playing with the load line calculator for the 2A3 driver, with a reasonably high impedance ...

I built a pair of IPL tl’s many years ago. Pretty good for the money I seem to remember. I think I still have the ribbon tweeters somewhere…..

Congratulations Nick!
Looks like a very successful shakedown.

The Lancaster flew right over our house yesterday, quite low.
Maybe they are doing a tour of Audio-talk members

Does the schematic imply that the matching speakers would have used field coils? And if so, does that have any implications if used with conventional speakers?

Lovely stuff!
If you zoom in on the photos, it actually specifies the valve types on the sockets, and I think I can just about make out 5Z3

This is from memory many years ago, so might be wrong…
At the base of the arm mounting is a large ring/cylinder with knurled plastic or rubber covering. You rotate that to change the height. But you need to unlock it first and I can’t remember how….

I think this is a video showing the plates Mike?
Looks satisfyingly complicated

Hmmm, I was wondering how come I had never seen or observed Omega Centauri.
It’s actually always below the horizon where I am, so I will have to travel south to see it.

This is the lot I go along to when I can make it. There's quite a few members into astrophotography, including cryogenics...

https://wtwastro.co.uk/


I just had a look at the gallery section of the website. The shot of Omega Centauri (NGC 5139) is absolutely gorgeous.
I will have a go at that ...

Cheers Nick.
Much better images are available on line, but I try to keep mine sort of like what we would see if we looked through a really big telescope.

Thanks Jack
(BTW I just replaced the original image with a version with a bit more saturation to the colors.)

Messier objects:
Charles Messier was a French astronomer who was only interested in finding comets. When he found a likely looking object, he would observe it over time to see if it was moving against the fixed background of stars. If it didn't move, it wasn't a comet, and he compiled a list of non ...

Hi Ray.
What size are the existing bass driver holes?
Could you turn the speakers upside down?
It might be that the existing holes will work. If they are a bit too small then by the time you've added a new baffle they might be big enough - assuming the drive units are 'tapered'
And the tweeter hole ...

Thanks Nick & Greg!