Remember These?

What people are working on at the moment
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Mike H
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Re: Remember These?

Post by Mike H » Sat Apr 06, 2019 7:40 pm

Is this going to Owston?
 
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Cressy Snr
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Re: Remember These?

Post by Cressy Snr » Sat Apr 06, 2019 8:32 pm

Mike H wrote:
Sat Apr 06, 2019 7:40 pm
Is this going to Owston?
Providing it doesn't blow up before the beginning of June, it'll be going to Owston.
I think it is the bees knees, but then I would wouldn’t I. :D

I've got a little idea to do with the Fanes too; an idea which Steve S suggested might have potential, last time I visited him. :wink:
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Re: Remember These?

Post by Mike H » Sun Apr 07, 2019 5:54 pm

We might have some good and interesting stuff for this fest. :thumbleft:
 
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Re: Remember These?

Post by Cressy Snr » Sat Apr 13, 2019 9:39 am

Mike H wrote:
Sun Apr 07, 2019 5:54 pm
We might have some good and interesting stuff for this fest. :thumbleft:
Aye, just a bit more to do with the cosmetics of the top plate before Owston. All them bolt heads give me the willies. :)
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pre65
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Re: Remember These?

Post by pre65 » Sat Apr 13, 2019 12:01 pm

Cressy Snr wrote:
Sat Apr 13, 2019 9:39 am

Aye, just a bit more to do with the cosmetics of the top plate before Owston. All them bolt heads give me the willies. :)
I hope they are all in line with each other ? :lol:
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Re: Remember These?

Post by Cressy Snr » Sat Apr 13, 2019 1:06 pm

pre65 wrote:
Sat Apr 13, 2019 12:01 pm
Cressy Snr wrote:
Sat Apr 13, 2019 9:39 am

Aye, just a bit more to do with the cosmetics of the top plate before Owston. All them bolt heads give me the willies. :)
I hope they are all in line with each other ? :lol:
That's the trouble, they are in a random pattern when seen from above the top plate. Maybe I'll embrace chaos and not cover them with a flat piece of aluminium. :)
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Re: Remember These?

Post by pre65 » Sat Apr 13, 2019 1:24 pm

Cressy Snr wrote:
Sat Apr 13, 2019 1:06 pm

That's the trouble, they are in a random pattern when seen from above the top plate. Maybe I'll embrace chaos and not cover them with a flat piece of aluminium. :)
KISS. :)
Life is what happens to you while you're busy making other plans. John Lennon

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Re: Remember These?

Post by Cressy Snr » Sat Apr 13, 2019 3:15 pm

Had the amp on the 'scope earlier this afternoon and have managed to further tweak up the squarewave response. I mean, it needs to be on its best behaviour for Owston n' est ce pas? Have changed out the 10K carbon comp grid stoppers for 2K2. This has given sharper corners on both the leading and trailing edges of the 1KHz and 10KHz traces.

Was highly wary of oscillation with these valves because of the high 35mA/V gm so I limited the bandwidth with the larger resistors, but I've taken the scope out as far as it will go and am not seeing anything untoward with the 2K2 stoppers.

A nice bit of filigree treble detail and quicker leading edge definition has emerged from wherever it was hiding, so the scope exercise was worth doing. I'm getting to like test equipment a lot. :)

So output stage grid stoppers should now be 2K2 or maybe the 1Ks that MJ uses.
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Re: Remember These?

Post by Mike H » Sat Apr 13, 2019 4:20 pm

:thumbleft:
 
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Re: Remember These?

Post by Cressy Snr » Sun Apr 14, 2019 10:27 am

Just a note about grid stoppers for Ray.
I put a wire link in the 10K position on the driver PCB and put the grid stopper resistors right up against the grid pin on the septar socket.
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Ray P
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Re: Remember These?

Post by Ray P » Sun Apr 14, 2019 12:20 pm

Cheers Steve :thumbup:

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Re: Remember These?

Post by Nick » Sun Apr 14, 2019 7:01 pm

they are in a random pattern when seen from above the top plate
I very much doubt that.
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Re: Remember These?

Post by Cressy Snr » Mon Apr 15, 2019 11:46 am

Nick wrote:
Sun Apr 14, 2019 7:01 pm
they are in a random pattern when seen from above the top plate
I very much doubt that.
Allright, so I was exaggerating! :D
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