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 Post subject: Something like AC30/4
PostPosted: Thu Mar 25, 2010 12:53 pm 
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Joined: Mon Jun 08, 2009 3:37 am
Posts: 5
Location: Solin, Croatia
Hi, my first post here, I'm Dino, from Croatia, my english is not very good, but you will understand pictures and clips, I made AC30 klon with only EF86 chanel and SS rectlifer.

Cut pot cap is from hoffmans scheme, and i think it i have to be 100n becouse cut working only at last quoter of turn


Last edited by sira on Thu Mar 25, 2010 12:57 pm, edited 2 times in total.

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 Post subject:
PostPosted: Thu Mar 25, 2010 12:54 pm 
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Joined: Mon Jun 08, 2009 3:37 am
Posts: 5
Location: Solin, Croatia
I have to make one more post to show you pics and clips:


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 Post subject:
PostPosted: Thu Mar 25, 2010 12:55 pm 
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Joined: Mon Jun 08, 2009 3:37 am
Posts: 5
Location: Solin, Croatia
Scheme:

http://blueguitar.org/new/schem/vox/ac34ef86.pdf I

some modifications on hoffman layout
Image

Chasis from old radio

Image



Image

Box:


Image

Image

Image

Some parts:

4 x EL84 JJ Tesla
1 x 6N2P for phase inverter
1x NOS Valvo EF86

Image

Its alive

Image

Image

clips

strat:
http://www.youtube.com/watch?v=SNRFFDkhJII

les paul:
http://www.youtube.com/watch?v=6HbLYfgTyFQ

speaker is eminence Legend V128


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 Post subject:
PostPosted: Thu Mar 25, 2010 2:36 pm 
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Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7430
Location: Brighton, Canada
Nice. What sort of B+ voltage are you running at.

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Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


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 Post subject:
PostPosted: Fri Mar 26, 2010 4:41 am 
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Joined: Mon Jun 08, 2009 3:37 am
Posts: 5
Location: Solin, Croatia
Thanks,

secondary winding on transformer is 300V, so B+ must be slight over that because it have SS rectlifer, i did not measure B+,iwas too happy it works, because it's my first amp :oops: :oops:


I forgot to mention, it have 6 point tone switch like matchless DC30, but i don't remember all Cap values, not identical values but close.


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 Post subject:
PostPosted: Fri Mar 26, 2010 7:34 am 
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Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7430
Location: Brighton, Canada
sira wrote:
secondary winding on transformer is 300V, so B+ must be slight over that because it have SS rectlifer, i did not measure B+,iwas too happy it works, because it's my first amp :oops: :oops:


I would measure the B+ becasue 300 V + SS rectifier might have more than 400 V on the plates of the EL84 and you shouldnt have that much.

A tube rectifier (5AR4) would probably solve that.

But I would check.

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Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


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 Post subject:
PostPosted: Fri Mar 26, 2010 9:28 am 
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Experienced
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Joined: Fri Mar 14, 2008 12:05 pm
Posts: 432
Location: Massachusetts
Quote:
Chasis from old radio

Good to see an "Earth-friendly" build 8) I especially like seeing those pieces of the transatlantic cable being put to good use :P :lol:

Joe G

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Some assembly required,
Brain sold separately...


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 Post subject:
PostPosted: Fri Mar 26, 2010 11:57 am 
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Joined: Mon Jun 08, 2009 3:37 am
Posts: 5
Location: Solin, Croatia
I know that i should measure B+, and i wanted do that when i finish box, but last 6 months waiting for free time :(
But Amp still working last 6 months, I played it every week two times for 2- hours, and it have good sound all time.


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