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Old

I guess I'll post this to my Blog!

Posted 2nd June 2011 at 08:01 AM by DigitalJunkie
Updated 2nd June 2011 at 08:08 AM by DigitalJunkie

Inspired by This Thread I decided to build something similar,I've though about it before,and had some parts sitting here,so what the heck!

Amp Schematic

PSU schematic


Here's what I've got at the moment.
25BQ6GTB tubes,(re-)branded DuMont. These are the skinny 6V6-sized bottles.(11W anode rating,and ~200V screen rating)

A pair of those are driving a 3.5K PP output transformer,rated for ~100W. (came from a scrapped Bogen M120 4x PPP 8417 amp.)

Bogen Schematic

B+=457V
Va=455V
B2+/Vg2=224V
Vg1=-43V
Vk (33ohm Rk's) ~1.3V ,About 40ma/tube.
(I saw cathode current peaks of ~80ma per tube,perhaps more? hard to tell with my DMM)

That gives a dissipation of ~18W per tube. Much more current and the plates start to 'blush'.
I did *not* see any screen glow,but the mica's on these particular tubes make it kind of hard to see much inside....
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Old

Yikes! Now what did I do?

Posted 1st June 2011 at 04:45 PM by Pano

This morning I was waking up the music server to have a listen. I run a Windoze XP box with JRiver Media Center.

JRiver gave me a pop-up error message that there had been an incomplete shutdown, did I want to fix any problems? There had been a power outage for a couple of hours last night that shut down the server. So if course I clicked "OK".

Bam! Screen goes dark. WTF? I look at the crossover and the tube amps - all dark. All dead. Now what I have done?

Well, it wasn't my mouse click that killed everything, the power was out again. Phew. But talk about scary timing. Click OK and everything dies right on the click.

Fortunately for us we have a 12KW generator that kicks in and can run the whole house.

All back to normal now.
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Old

For those interested in Speakers Here how is made

Posted 27th May 2011 at 06:55 PM by ANYspeakersrepair

You can see how a speaker is made in
Discovery channel how speaker is made
or http://www.youtube.com/watch?v=VN0tmyyC0ak
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Old

ETI 480 Power Supply

Posted 26th May 2011 at 07:36 AM by jayb1

I have an old Dick Smiths ETI 480 Power Supply. What I don't have ia any information or the Scematic for it.Tthere is plenty of information for the 480 Amp, but that's not what I want. Just the instructions for the Power Supply.

Any help please.
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Old

TSEC's Jordan JX92 Cabinets Under Construction.

Posted 23rd May 2011 at 06:26 PM by The Space Egg Corp

TSEC's Jordan JX92 Cabinets Under Construction.
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Old

TSEC's Karlson Project Is Progressing.

Posted 23rd May 2011 at 05:57 PM by The Space Egg Corp

Plywood & MDF flattening.
Possible cabinet layout drawing.
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Old

Transformer for Pedja Rogic´s DDNF I/V Stage

Posted 23rd May 2011 at 10:44 AM by dvb projekt
Updated 14th June 2013 at 09:47 AM by dvb projekt

If you would build the DDNF I/V stage with my PSU & Salas Shunt modules,
you could order a custom made transformer at
AE-Europe.

It has the following data:

Primary:

115-0 / 115-0
(for 115V & 230V usage)

Secondary:

24V-0-24V / 2A
24V-0 / 2A
Magnetic Shield

You could order two versions:

- Standard: EI-core € 64,-

- High End: C-core (same size as 30317) € 112,-

Prices are excl. shipping and VAT
Delivery time around 6 weeks after order.


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Old

Intel, thanks for all the fish!

Posted 19th May 2011 at 01:47 AM by abraxalito
Updated 8th September 2011 at 03:15 AM by abraxalito

Intel's just held their 2011 investor conference. I'm not an Intel investor but after that performance if I were, I'd have sold out by now.

Welcome to the wonderful world of ARM guys!

If you want to get down and dirty, here are a couple of articles to get you started. Be sure to check out the comments!

Updated: Intel rewrites Atom road map

AnandTech - Intel?s 2011 Investor Meeting - Intel?s Architecture Group: 14nm Airmont Atom In 2014

If you'd like an illustration remarkably parallel to Intel's style of groupthink, go here:

Wake-up call | World news | The Guardian
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Western electric tubes and a hickok 600a

Posted 17th May 2011 at 05:34 PM by sstshopping

I need the settings for as mant western tubes i can find for my hickok 600a, I recently found over 100 in a friends basement! Please help!
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Old

Pedja Rogic´s Discrete Diamond Non-Feedback I/V Stage - Out of production

Posted 17th May 2011 at 04:15 PM by dvb projekt
Updated 14th June 2013 at 09:46 AM by dvb projekt

For all of you who want an alternative non-tube I/V stage,
Pedja Rogic was so kind and permit me to make a pcb with his circuit.

To get a smaller pcb, i made two connectors for the needed big 10µF caps.


Click the image to open in full size.


The PCB will have the following data:

Material: FR4 - 2mm
Layers: 2
Board size: 110x95 mm
Surface finish: Immersion Gold
Copper weight: 70µm
Soldermask: Both sides - green
Silkscreen: Legend on top

Out of production

Attached Files
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File Type: zip Pedja Rogic´s DDNF IV Stage BOM.zip (4.9 KB, 526 views)
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