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| | |-+  Need help with 18Watt Kit...Please		 « previous next »
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Author Topic: Need help with 18Watt Kit...Please  (Read 5133 times)
Mule3
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« on: June 04, 2011, 01:22:45 PM »
Hi,
Got my 18watt kit in 2-3 weeks ago...have been taking my time putting it together making sure everything is right with the layout.

Got several questions... I'll post one at a time...

Got my power supply from GDS, on it there are two 6.3 volt feeds. One is 3amp and the other is 1 amp. I believe one goes to the indicator and the other goes to V-1 thru V-5 tubes...

Does the one amp 6.3v go to the indicator.... and the 3 amp 6.3v go to the tubes?

Thanks, Mule3
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wyatt
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« Reply #1 on: June 04, 2011, 01:47:16 PM »
6.3v 3-amp winding does the preamp and power tubes (V1-V5) and the lamp. (these draw approx. 2.5A total: 0.76A per El84 and 0.3A per 12AX7)

6.3v 1-amp winding to rectifier tube (V6).  A EZ81 draws 1A.

Here's the schematic for the Marshall original...
http://www.ampwares.com/schematics/marshall/marshall_18watt_schem.pdf

You'll see Nik's layout does the same.  He has a non-center-tapped 6.3V wiring to the EZ81 heaters (H1, H2) .  And the center-tapped winding (3.15-0-3.15...center tapped unused in this case) to the lamp and the other tubes (F1, F2).

I don't have GDS chart to see if his windings are the same way.
« Last Edit: June 04, 2011, 01:56:49 PM by wyatt » Logged
Mule3
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« Reply #2 on: June 04, 2011, 02:00:32 PM »
Thanks Wyatt....

by the way.... is it possible to post pictures here?
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wyatt
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« Reply #3 on: June 04, 2011, 03:00:03 PM »
To my knowledge, you have to have them hosted online already, then you use the URL inside the image tags (or the little "picture" button up above the text enter field).  I don't think you can attach a picture and upload it directly to the message.
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