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| | |-+  Connecting the 1 ohm bias resistor on power tubes V4 and V5		 « previous next »
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Author Topic: Connecting the 1 ohm bias resistor on power tubes V4 and V5  (Read 4203 times)
francois
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« on: December 18, 2012, 10:40:54 PM »
Hi there !

The originial Marshall diagramm do not show this resistor connected between pin 8 and ground on V4 and V5.

Reading the METROAMP instructions for JTM45 the layout is a bit different as pin 1 is connected to ground and not to 8 (picture attached).

Can you advice on the difference ? Is it important ?

Thank you for your help.

* 18-12-2012 22-03-44.png (18.69 KB, 320x258 - viewed 733 times.)
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T Wilcox
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« Reply #1 on: December 19, 2012, 01:28:52 AM »
There is a jumper between pin 1 and 8 of the power tubes so electrically there is no difference between pin 1 or pin 8

Todd
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francois
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« Reply #2 on: December 19, 2012, 11:22:48 AM »
Thank you Todd,

So, i think instructions for Metro (and the schematic in my previous post) are false as the  resistor is not used due to the internal jump.between 1 and 8  Wink

I deduce also that the external strap between 1 and 8  on the CERIATONE layout is a spare. Right?

So i will correct my homework to better comply with the layout
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