Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Geomalidis on March 25, 2025, 03:57:53 pm
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Hi guys !
I am trying to make a Laney lbo 100 from scratch and I can not find the models of the three transformers that are needed.
Does anybody know them and where can I buy them ?
Help will be appreciated.
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Looks like 4 x EL34s and 3 x 12AX7s. Any 100W PT designed for EL34s ought to work, and any HT choke and 100W OT designed for Marshall JMP 100 ought to work
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Looks like 4 x EL34s and 3 x 12AX7s. Any 100W PT designed for EL34s ought to work, and any HT choke and 100W OT designed for Marshall JMP 100 ought to work
So if I have understood correctly these are the 3 I need :1)https://modulusamplification.com/100w-power-transformer-for-jcm800-with-12v-tap--high-grade-laminations-3413-p.asp
2)https://www.tubetown.net/ttstore/en/tt-output-transformer-dumble-style-100-watt-6l6-el34.html
3)https://www.tubeampdoctor.com/en/choke-for-marshall-100w/50w-for-2203-2204-220
Btw I am new to amp building so if I have anything wrong , please be kind enough to correct me.
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New to amp building ?
Best is to begin with a smaller ( and easier amp) , not a 100 watts amp.
Too many chances to have some issue or / and damage certain parts. And let's not forget that no one needs such a powerful and heavy amp.
Show schematic , I can't find any information about a Laney lbo 100 amp .
Is it the right model ?
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Post links like that to direct acces ;
https://modulusamplification.com/100w-power-transformer-for-jcm800-with-12v-tap--high-grade-laminations-3413-p.asp
https://www.tubetown.net/ttstore/en/tt-output-transformer-dumble-style-100-watt-6l6-el34.html
https://www.tubeampdoctor.com/en/choke-for-marshall-100w/50w-for-2203-2204-220
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Use a good layout if you want easier building with less issues.
Like this one, a 50 watts amp.
https://el34world.com/Hoffman/files/Hoffman_Plexi50.pdf
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New to amp building ?
Best is to begin with a smaller ( and easier amp) , not a 100 watt amp
I have made another one but it is very small. It is like 3w
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So it will be your second amp ,
Why a 100 watts ?
Show the schematic.
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So it will be your second amp ,
Why a 100 watts ?
Show the schematic.
It is 100watts because I could not find the 60 watt schematic.
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This amp schematics you show is a SG100 mk1
Why you post is about a lbo100 amp wich I can't find ?
Why not a 50 watts ?
Laney LC50. https://el34world.com/charts/Schematics/files/Laney/Laney_lc50_combo.pdf
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Firstly, the laney lbo 100 is the laney supergroup but lbo 100 was the name that it was called when it came out.
Secondly , I dont want to build the amp you sent to me I want to build the supergoup 100
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Firstly, the laney lbo 100 is the laney supergroup but lbo 100 was the name that it was called when it came out.
Secondly , I dont want to build the amp you sent to me I want to build the supergoup 100
I send you the 50 watts because you said you can't find the 60 watts
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Laney 60
https://el34world.com/Forum/index.php?topic=18718.0
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Laney 60