Another Eiclone.....work in progress

a DIY, modified Mullard 5-20 monoblock design

Another Eiclone.....work in progress

Postby Andrea80 » Tue Jan 23, 2007 4:25 pm

Hi all,

I got all the parts and I start to build the amps Yellow_Light_Colorz_PDT_08

I made 2 pcb, one for power supply the other for driver.
Custom made power trannies from italian producer.
1650N Hammond output trannies Yellow_Light_Colorz_PDT_12
Electro Harmonix EL34
Golden Dragon 6SN7
Valvo 12AX7
Sovtek GZ34

Here some pics:

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Thanks to all for support.
I'll write here upgrades of building.

Bye
Andrea80
 
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Location: Italy

Postby WA4SWJ » Tue Jan 23, 2007 5:52 pm

Nice work! Looking forward to seeing the finished units.
Ed Long
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Postby Andrea80 » Wed Jan 24, 2007 3:35 pm

thanks a lot Ed! :)
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Postby Andrea80 » Wed Feb 14, 2007 4:36 pm

Hi all,

Here the case after the painting... in a beautiful sunny day:

Image Image

The wiring of the driver board

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The inside in "test version", I have to improve the wiring and make rear/front panels.

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The amp looks like this Yellow_Light_Colorz_PDT_12

Image

I have checked the sound for only 5 min today... the amp works fine!
Now I set the bias at 40 mA...will be increased to 50-55mA to get "warm" sound Yellow_Light_Colorz_PDT_08

Bye,
Andrea
Andrea80
 
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Postby Shannon Parks » Wed Feb 14, 2007 4:42 pm

Hi Andrea,

Chassis looks nice! What's your B+ looking like? I think you can tweak that bias up no problem.
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Postby WA4SWJ » Wed Feb 14, 2007 5:56 pm

Andrea,

Nice work! I like the chassis and also the circuit boards. Congratulations!

Regards,
Ed Long
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Postby Andrea80 » Thu Feb 15, 2007 3:23 pm

Thanks a lot for all guys!!!

Tonight I have increased bias at 45 mA...minute after minute the amp gets a wonderful face....I love it! Yellow_Light_Colorz_PDT_16

@Shannon
B+ is 480-485V, depend on the value of supply network...around 215-220V.
Andrea80
 
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Location: Italy

Postby Shannon Parks » Thu Feb 15, 2007 7:08 pm

Andrea80 wrote:Now I set the bias at 40 mA...will be increased to 50-55mA to get "warm" sound Yellow_Light_Colorz_PDT_08


Go straight ahead to 55mA. They won't even break a sweat and it'll sound fantastic. ;)
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Postby Andrea80 » Tue Feb 20, 2007 2:02 pm

thank you so much Shannon for your help/support!
This amp is great!
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Re: Another Eiclone.....work in progress

Postby Andrea80 » Sun Feb 28, 2016 12:05 pm

Dears,

after nine 8 years (9 !!!) my Eiclones still work hard , now I want try the 6550 upgrade (lol).
The maximum plate dissipation of this tube is rated 36 watts, so the limit current I can go is 36 / B+

What do you suggest?

Thank you guys.

Andrea
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