50 watt plexi kit instructions

Get support and show off your MetroAmp 50 Watt kit builds.

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Post by Roe » Thu Jun 19, 2008 7:27 am

here's some info on filtering: http://marstran.com/Historic%20Data%20Base.htm
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Re: 50 watt plexi kit instructions

Post by budubum » Sat Sep 20, 2008 6:51 am

i have a question.

when doing the testing, is it ok to run the amp on play mode with the preamp tubes in but with out the speaker load and the el34 tubes?
it seems to me that it didnt mention the load on preaamp only with no power tubes. the insert a load is mentioned on the part where to install th epower tubes.

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Re: 50 watt plexi kit instructions

Post by thousandshirts » Tue Sep 23, 2008 11:45 pm

Sure. You can go from standby to "operate" with no speaker load when you don't have any power tubes installed. If you put in power tubes (feeding the OT with pure tube goodness), then you need a speaker load on the other side of the OT to deal with that power.

In the instructions it says, "Power off and install (2) EL34 output tubes. Attach a speaker and power the amp on. . . " Seemed clear enough to me, but there are a lot of instructions to read, and people read them different ways. But to be sure, go right ahead. Just be sure to have a load attached if you have power tubes installed.

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Re: 50 watt plexi kit instructions

Post by budubum » Wed Sep 24, 2008 1:47 am

thousandshirts wrote:Sure. You can go from standby to "operate" with no speaker load when you don't have any power tubes installed. If you put in power tubes (feeding the OT with pure tube goodness), then you need a speaker load on the other side of the OT to deal with that power.

In the instructions it says, "Power off and install (2) EL34 output tubes. Attach a speaker and power the amp on. . . " Seemed clear enough to me, but there are a lot of instructions to read, and people read them different ways. But to be sure, go right ahead. Just be sure to have a load attached if you have power tubes installed.
yeah i know that part and have read it over and over . it just confused me why it was said so ONLY in the power section and not in the pre section. thinking of a double open curcuit. but oh wel now you confirmed it8)

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Re: 50 watt plexi kit instructions

Post by capelton » Sat Sep 27, 2008 9:20 pm

Reading that makes me consider buying a kit. But, Plexi style, or metal-paneled. Hmm...
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Re: 50 watt plexi kit instructions

Post by budubum » Sun Sep 28, 2008 2:46 am

capelton wrote:Reading that makes me consider buying a kit. But, Plexi style, or metal-paneled. Hmm...

well? what are you waitin for? 8)

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Re: 50 watt plexi kit instructions

Post by thousandshirts » Sun Sep 28, 2008 1:38 pm

capelton wrote:Reading that makes me consider buying a kit. But, Plexi style, or metal-paneled. Hmm...
You can build your kit and switch back and forth between Plexi or Metal Panel by changing just a few components. $25 of parts at the outside, if you buy a nice filter cap for the 33/33 or 50/50.

http://forum.metroamp.com/viewtopic.php ... 6&start=40" onclick="window.open(this.href);return false;

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Re: 50 watt plexi kit instructions

Post by Geetarpicker » Sun Nov 16, 2008 4:47 pm

Is a 50/50 axial cap available that can fit directly on the board "down below" style?

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Re: 50 watt plexi kit instructions

Post by Wayne » Tue Jan 13, 2009 10:13 pm

Minor stuff here - just from the parts list.

Sozo .68uF@400v - i think should be .68uF@160v
25k Audio taper pot - i think should be 25k Linear pot

Also listed is a 220uF electrolytic @ 50v.
This doesn't seem to be available from the parts store and i assume 25v version is suitable ?

Other than that - AWESOME.
I've order my bits - can't wait to get started.
Thanks George for the quick response to my emails !!

Wayne.

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Re: 50 watt plexi kit instructions

Post by Roe » Wed Jan 14, 2009 6:25 am

Wayne wrote:Minor stuff here - just from the parts list.

Sozo .68uF@400v - i think should be .68uF@160v
25k Audio taper pot - i think should be 25k Linear pot

Also listed is a 220uF electrolytic @ 50v.
This doesn't seem to be available from the parts store and i assume 25v version is suitable ?

Other than that - AWESOME.
I've order my bits - can't wait to get started.
Thanks George for the quick response to my emails !!

Wayne.
yes 160v and 25 is fine. there's about 1v on v1a k and v1b k
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Re: 50 watt plexi kit instructions

Post by VelvetGeorge » Thu Sep 03, 2009 2:12 pm

Instructions updated to V 1.2 Sept 2009.

Fixed various typos and added text.

Notes for voltage chart and standby switch voltage measurement added.



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Re: 50 watt plexi kit instructions

Post by grindliner » Mon Nov 09, 2009 10:26 pm

Great instructions,

need to add instructions about wiring the board to 1986 Bass specs, to omit the wire from the board that would go to to V-1 pin 8, and place jumper between pins 3 and 8.

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Re: 50 watt plexi kit instructions

Post by Structo » Tue Nov 10, 2009 12:01 pm

Isn't the one with the split cathode (1987) more of a lead config and the 1986 (common cathode) more of a bass type?
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Re: 50 watt plexi kit instructions

Post by syscokid » Sat Nov 21, 2009 1:42 pm

VelvetGeorge wrote:Instructions updated to V 1.2 Sept 2009.

Fixed various typos and added text.

Notes for voltage chart and standby switch voltage measurement added.



george
Thanks George... 8)
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Re: 50 watt plexi kit instructions

Post by fillmore nyc » Wed Sep 01, 2010 7:43 am

Can someone please tell me where the shorter choke wire is connected?? I see the wire that is twisted together and connected to the upper right corner of the board, but I cant find anything about where the OTHER wire from the choke wire attaches.
grindliner wrote:Some of us are noobs.
What he said...

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