Welcome, Guest. Please login or register.
Did you miss your activation email?
November 24, 2024, 04:19:18 PM
Home Help Search Login Register
News: Ceriatone Forums are up and running!!!
 
Guests please register
Note: If you want to help you can donate to keep the forums alive.



Do you want to advertise on this forum ? Send me a private message.

Amplified Parts
+  Ceriatone Forum
|-+  British Style
| |-+  JTM 45, 50
| | |-+  Connecting the 1 ohm bias resistor on power tubes V4 and V5		 « previous next »
Pages: [1] Go Down Print
Author Topic: Connecting the 1 ohm bias resistor on power tubes V4 and V5  (Read 4214 times)
francois
Newbie
*
Offline Offline

Posts: 7


View Profile
« 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 736 times.)
Logged
T Wilcox
Sr. Member
****
Offline Offline

Gender: Male
Posts: 399



View Profile
« 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
Logged
Plexi bass 1986 ( build #6 )
Ceriatone Ultra Champ ( build #5 )
TW Express clone ( build #4 )
Ceriatone HRM MK2 ( build #3 )
Ceriatone 2550  ( Build #2 )
Ceriatone OTS FM50 Modern Eagle Mod (Build #1)
EBMM Steve Morse original
50th anniv American Strat
francois
Newbie
*
Offline Offline

Posts: 7


View Profile
« 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
Logged
Pages: [1] Go Up Print 
« previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.12 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!

CeriaTone Forum is not afiliated with Ceriatone Amplifications. The CeriaTone and name, logo and related trademarks and service marks, owned by CeriaTone. , are registered and/or used in the U.S. and many foreign countries. All other trademarks, service marks, and trade names referenced in this site are the property of their respective owners.