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You saw the bottom.
The top side:
The tubes are mounted on an iso- suspended mounting plate, 3mm aluminum.
Chassis is the 240mm wide x 360mm x 70mm Projekt style. Very rigid.
Sockets are teflon, except for the 310a.
The RCA input is at the back where you like it. Although the output transformer comes with 4/8/16 secondary, there are only 3 speaker binding post: 0/4/8 or 0/8/16 - whatever suits.
Horn guys: These are quiet! 0.2mv.
Running in now and I'm mighty pleased with how this has turned out.
Next I'll get out the adding machine to determine where this lands cost-wize.
Our universe became a little disordered last year when we introduced the single chassis LD dual mono. Due to escalating costs the 8 year old LD monoblock was not sustainable as a product on two counts: 1. cost of materials and manufacturing had almost tripled since the original Billie was offered for $700 (including all the upgrades we progressively built into the kit) and 2. shipping overseas by Fedex had doubled from <$200USD originally to >$400USD by 2009 (also due to the extra weight of all the upgrades and enhancements).
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DC offset appears at the wall socket, riding on the back of the ACv we need. Of course a little DC across the transformer quickly decreases efficiency and raises the temperature core. When we apply the Auto Bias Modules in the Ella we immediately note better sound -- less strain, wider bandwidth -- because no DC is allowed to flow across the output transformer.
Today I ran the power transformer of the Ergo-Ella first plugged into the wall socket, then plugged into a huge isolation transformer we have here. I've previously measured 0.4-0.5DCv at our wall socket.
Our ambient room temperature is 34C today.
After 1 hour:
from wall socket: +24C
from isolation transformer: +21C
Next we will setup a three way comparison w/wo DC Blokker and direct from the wall.
Questions from customers are good because they remind of features not yet discussed:
Why doesn't the Ergo-Ella have dual-mono power supplies like the previous Ella?
1. Actually the power transformer does have dual secondaries, both being connected in parallel to the FCUPS. This gives a very low output source impedance from the power transformer and power on demand
2. The FCUPS is set to run in virtual battery mode. It has the energy storage equivalency of about a 2 FARAD capacitor but the delivery and recovery speed of a 500h choke!
3. The point of a dual mono power supply is to avoid intermodulation effects between channels due to voltage sag. As per above you can see this is never likely to happen with paralleled HT feeds and the FCUPS.
I've posted a reduced resolution version of the Ergo-Ella instruction manual. Please take a look. The main part of it is picture based as many have requested.
We'll continue to add some polish and gratefully receive suggestions for improvement.
AS I'm getting a lot of requests for information about the differences between the Cole LCR and the Vinyl Song:
The question was asked if the single chassis Vinyl Song LCR phono might be compromised compared to the Cole LCR which has two boxes.
Not at all.
The Vinyl Song has also got 2 boxes! It's just that the transformers are placed inside an iron shielding box inside the Projekt box.
In fact the Vinyl Song has got 2 power transformers and is true dual mono from PS to output. Nothing is shared. This is done by using 2 special low flux power transformers instead of one big one in a remote location box.
There are other differences between the Cole LCR and the Vinyl Song LCR such as tube rectification etc. But they both got boxes.
And that's the way it is.
The Top Side
Left:
- main power transformer under the vented cover
- 2 filament transformers under the forward cover
btw, our heater voltages were running a bit high but all other voltages spot on. With separate filament transformers (and 105+10+10 x 2 primaries) tweeking the voltages is just a matter of changing a bus wire on the primary side. So EZ.
Right:
- 2 film caps for loading the input or output of the FCUPS power supply. We are running in virtual battery mode so we put the film caps on the input side
- Output transformer covers (4/8/16ohm standard)
Middle:
- 2ea x ECC88, 6SN7 and 4 ea EL34
On the right:
All the AC stuff - IEC connector, transformers, power switch
power transformer matrix:
-1 large one for B+ and 2 small ones for filament supply
- terminal strips allow easy switching and adding/subtracting voltages for many circuits, KT88/2A3 PP, 300b or what-have-you SE
On the left:
All the DC stuff - FCUPS (film cap universal power supply), ABS (active bias supply), input filter caps
- FCUPS: all film caps power supply in a package comparable in size to toxic electrolytics.
- electronic choke on board with equivalent 500h allows use as virtual battery supply.
- ABS modules. These lock the bias of each tube so anode current is in perfect balance so no DC goes across the OPT core.