Remember These?

What people are working on at the moment
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IslandPink
Oooo, Roberts Radio's sound nice
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Re: Remember These?

Post by IslandPink » Thu Nov 14, 2019 10:19 pm

Looked like an ideal base for some fibreglass and a bit of filler !
"The bass is the king of the instruments - it has no known natural predator" (Wobble)

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pre65
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Re: Remember These?

Post by pre65 » Thu Nov 14, 2019 10:25 pm

IslandPink wrote:
Thu Nov 14, 2019 10:19 pm
Looked like an ideal base for some fibreglass and a bit of filler !
Or even papier mache ?

Bits of old newspaper with flour and water.
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Re: Remember These?

Post by RhythMick » Thu Nov 14, 2019 11:24 pm

Cressy Snr wrote:
Thu Nov 14, 2019 7:29 pm
Nah it looks fecking horrible.
I took it off. It looked like a pair of chokes with a chip basket over them. :lol:

It’s now been cut down in height, and turned through 90 deg.
Much better.
I actually spat my tea then ... ROFL

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jack
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Re: Remember These?

Post by jack » Fri Nov 15, 2019 9:40 am

You can make very smart boxes out of unused fr4 (solder the edges together on the inside)... Solder your nuts into the corners (queue DtB) and round off the edges... Spray black and Robert's your father's brother...

Or spray it a nice fleshy pink like the chip basket...
Last edited by jack on Fri Nov 15, 2019 10:15 am, edited 1 time in total.
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izzy wizzy
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Re: Remember These?

Post by izzy wizzy » Fri Nov 15, 2019 9:49 am

pre65 wrote:
Thu Nov 14, 2019 10:25 pm
Or even papier mache ?
Bits of old newspaper with flour and water.
Pressed into tupperware or similar as a mould, could be very smooth.

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Ray P
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Re: Remember These?

Post by Ray P » Fri Nov 15, 2019 11:11 am

I've toyed with using papier mache for speaker cabinets before. There are some proprietary mixes around with plaster filler that are meant to be excellent for a finish and hard too.

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Dave the bass
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Re: Remember These?

Post by Dave the bass » Fri Nov 15, 2019 5:05 pm

jack wrote:
Fri Nov 15, 2019 9:40 am
... Solder your nuts into the corners (queue DtB) ..... a nice fleshy pink like...
Sniggers!

Reporting for action Sir *does daft salute*
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Stew my foot and call me Brenda".

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Re: Remember These?

Post by Cressy Snr » Fri Nov 15, 2019 7:04 pm

I’ve abandoned covers altogether. I took the tatty old labels off the chokes and they actually don’t look bad at all.

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IslandPink
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Re: Remember These?

Post by IslandPink » Fri Nov 15, 2019 9:30 pm

Steampunk ! - just apply some patina .
"The bass is the king of the instruments - it has no known natural predator" (Wobble)

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Re: Remember These?

Post by Cressy Snr » Fri Nov 15, 2019 10:32 pm

IslandPink wrote:
Fri Nov 15, 2019 9:30 pm
Steampunk ! - just apply some patina .
I keep thinking about doing Steampunk amps. One of these days I’m going to go to town with it. Valves and Steampunk are obvious bedfellows.

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Re: Remember These?

Post by Mike H » Sat Nov 16, 2019 12:03 am

Cressy Snr wrote:
Thu Nov 14, 2019 7:29 pm
Nah it looks fecking horrible.
I took it off. It looked like a pair of chokes with a chip basket over them. :lol:
Image
 
I never make the same mistake twice. Instead I prefer to fill my day with a variety of different mistakes

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IslandPink
Oooo, Roberts Radio's sound nice
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Re: Remember These?

Post by IslandPink » Sat Nov 16, 2019 5:56 pm

Cressy Snr wrote:
Fri Nov 15, 2019 10:32 pm
I keep thinking about doing Steampunk amps. One of these days I’m going to go to town with it. Valves and Steampunk are obvious bedfellows.
Have a look through here, the finish on some of these lovely things has got me thinking about it !
http://myemia.com/_FC.html
( ps. the symbols on the left are page links )
"The bass is the king of the instruments - it has no known natural predator" (Wobble)

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Re: Remember These?

Post by Cressy Snr » Sat Nov 16, 2019 9:07 pm

IslandPink wrote:
Sat Nov 16, 2019 5:56 pm
Cressy Snr wrote:
Fri Nov 15, 2019 10:32 pm
I keep thinking about doing Steampunk amps. One of these days I’m going to go to town with it. Valves and Steampunk are obvious bedfellows.
Have a look through here, the finish on some of these lovely things has got me thinking about it !
http://myemia.com/_FC.html
( ps. the symbols on the left are page links )
Fabulous!
I’ll start a new thread.

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Mike H
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Re: Remember These?

Post by Mike H » Sat Nov 16, 2019 10:22 pm

there are different genres apparently

-
punk-genres.jpg
 
I never make the same mistake twice. Instead I prefer to fill my day with a variety of different mistakes

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Re: Remember These?

Post by Cressy Snr » Wed Nov 20, 2019 1:33 pm

OK,
Here are the schematics for the audio circuit and the power supplies.
The power supplies are old school, no regulation as there is a limit to what can be squoze onto a stereo chassis of a reasonable size. Besides, I don’t have enough HT for that sort of stuff.

There is no doubt room for improvement: for example, the driver stage bias voltage could be tweaked by a couple volts to get it dead centre, for absolute max clean swing, but it’s not far out, so it’ll do for now. Remember also that this is built out of donated PCBs, one of a pair of Sowter chokes that Mr I gave me a very good deal on, and whatever else I had to hand. Consequently, some parts in the power supplies are OK, whilst others are stupidly over-specced, but you work with what you’ve got when you’re on a budget.


I’ve also after the fact, seen this on DIYAudio...“NEVER put an interstage transformer or plate choke inside a global feedback loop” but there don’t seem to be any problems with my plate choke setup, probably because there is no output transformer sticking its oar in. Apart from the potential to tweak the driver bias, the audio circuit performs quite nicely.
B1681175-C5F5-4CAB-85AF-86F9DAE59B55.jpeg
BD833685-F3C4-4E24-B281-B69A30FC6E19.jpeg
The feedback level has been doubled to drop the gain and further clean the window into the performance. Both the doubling of the feedback and the triple power supply came about after visiting and talking with Steve a few weeks ago.

For sound per pound, this is a good value amp.
Last edited by Cressy Snr on Wed Nov 20, 2019 2:57 pm, edited 5 times in total.

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