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Hoffman Amps Forum image Author Topic: Laney lbo 100 3 transformer models needed  (Read 1412 times)

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Offline Geomalidis

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Laney lbo 100 3 transformer models needed
« on: March 25, 2025, 03:57:53 pm »
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.

Offline tubeswell

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Re: Laney lbo 100 3 transformer models needed
« Reply #1 on: March 25, 2025, 04:13:20 pm »
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
A bus stops at a bus station. A train stops at a train station. On my desk, I have a work station.

Offline Geomalidis

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Re: Laney lbo 100 3 transformer models needed
« Reply #2 on: March 26, 2025, 02:45:31 am »
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.

Offline Latole

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Re: Laney lbo 100 3 transformer models needed
« Reply #3 on: March 26, 2025, 05:03:00 am »
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 ?
« Last Edit: March 26, 2025, 05:09:48 am by Latole »


Offline Latole

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Re: Laney lbo 100 3 transformer models needed
« Reply #5 on: March 26, 2025, 05:49:22 am »
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


Offline Geomalidis

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Re: Laney lbo 100 3 transformer models needed
« Reply #6 on: March 26, 2025, 08:07:16 am »
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

Offline Latole

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Re: Laney lbo 100 3 transformer models needed
« Reply #7 on: March 26, 2025, 08:24:26 am »
So it will be your second amp ,

Why a 100 watts ?

Show the schematic.

Offline Geomalidis

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Re: Laney lbo 100 3 transformer models needed
« Reply #8 on: March 26, 2025, 08:57:46 am »
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.



Offline Latole

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Re: Laney lbo 100 3 transformer models needed
« Reply #9 on: March 26, 2025, 09:37:22 am »
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

« Last Edit: March 26, 2025, 09:40:52 am by Latole »

Offline Geomalidis

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Re: Laney lbo 100 3 transformer models needed
« Reply #10 on: March 26, 2025, 09:55:03 am »
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

Offline Latole

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Re: Laney lbo 100 3 transformer models needed
« Reply #11 on: March 26, 2025, 10:47:26 am »
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

Offline Latole

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Re: Laney lbo 100 3 transformer models needed
« Reply #12 on: March 26, 2025, 10:53:36 am »

Offline Latole

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Re: Laney lbo 100 3 transformer models needed
« Reply #13 on: March 26, 2025, 10:54:27 am »
Laney 60


 


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