Motown Direct Amplifier-inspired Preamp?

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untune

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Oct 28, 2016
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212
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Manchester, UK
I wish someone would do a nice steel 19 inch case with aluminium front and back panels - they are so much easier to woodwork with than steel.
Ian, I have used these from CPC in the past for an AML EZ1073 and an Oakley filter, case is 1.2mm steel and the front panel is 3mm aluminium... despite the rear panel being steel I have put XLRs, jacks and an IEC/switch in them and don't remember it being too much hassle.

CPC doesn't have any good technical documentation on them for some reason, but look at Penn Elcom's site here at the Q&As and they state that if you send them the necessary design, they will custom cut the rear panel for you, not sure on cost though. For some reason it's cheaper to buy them from CPC than PE directly but apprently they price match so, maybe worth enquiring :unsure:

Only things I didn't like on these was: the venting in the top panel—not for any real reason other than aesthetic preference, but if you were doing anything with valves you might want them to breathe anyway! And minimum 220mm depth, they felt a bit oversized (for my needs at least) but if you like a lot of space then again, not really a concern.

Cheers
 

MidnightArrakis

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Joined
Sep 25, 2015
Messages
80
Since I see that you fellows are discussing "rack-mount" chassis and enclosures, I thought I would share with you another potential supplier that sells their products in both the EU and the USA. They are called -- OKW Enclosures -- and they have a rather wide range of not only "rack-mount" enclosures, but also all manner of desktop, handheld, wall-mount and even wearable enclosures. Here are some links to their different "rack-mount" series of enclosures:

OKW Enclosures -- Combimet Series

OKW Enclosures -- Unimet Series

OKW Enclosures -- VersaMet Series

OKW Enclosures -- Mettec Series

And.....just for general enclosure browsing, you can visit their website at: okwenclosures.com

In addition, should you not be interested in drilling/filing/hacking your new enclosure for your project, OKW will also do the machining for you (at a cost).

I hope this helps everyone out!!!

/
 

untune

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Oct 28, 2016
Messages
212
Location
Manchester, UK
Quick question... in my haste to trim the fat from the schem, I scrubbed the 5v tap from the PSU thinking there would be no need for one. Only afterwards did I think about the possibility of a power indicator/pilot lamp. What is the best approach—use a power transformer with a dedicated additional tap, or is it safe to feed a bulb from the 6.3V tap in parallel with the heaters (as long as there is sufficient current)?
 

abbey road d enfer

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Jan 22, 2008
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12,662
Location
Marcelland
Quick question... in my haste to trim the fat from the schem, I scrubbed the 5v tap from the PSU thinking there would be no need for one. Only afterwards did I think about the possibility of a power indicator/pilot lamp. What is the best approach—use a power transformer with a dedicated additional tap, or is it safe to feed a bulb from the 6.3V tap in parallel with the heaters (as long as there is sufficient current)?
That's how it's been done for years. However I would recommend the use of an LED-based pilot light. Less current draw, less heat, no maintenance.
 

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