Hi, Im new to this site and this "hobby" I recently purchased a SE Board with the intent of building a 300B based amp. How ever I am having problems with the instructions. The site mentioned a CD that would would accompany the board and there was not one and I can find no references to the wiring for the terminal inputs/outputs on the board. I dont know if i am just missing the obvious or if these instructions should have been on the missing CD.
Any help and or guidance would be appreciated.
Any help and or guidance would be appreciated.
Here ya go:
Assembly Manual | Tubelab
And:
Schematic | Tubelab
Connections:
T1-1 - B+ Supply Center Tap
T1-2 - Rectifier Heater
T1-3 - Rectifier Heater
T1-4 - B+ Supply
T1-5 - B+ Supply
T1-6 - Heater Supply
T1-7 - Heater Supply
T1-8 - Heater Supply Center Tap
R4 - Right Positive Input
R5 - Right Negative Input
T2-1 - Right B+ Supply to Output Transformer
T2-2 - Right Plate to Output Transformer
L4 - Left Positive Input
L5 - Left Negative Input
T3-1 - Left B+ Supply to Output Transformer
T3-2 - Left Plate to Output Transformer
I think that's all of 'em..
-Steve
Assembly Manual | Tubelab
And:
Schematic | Tubelab
Connections:
T1-1 - B+ Supply Center Tap
T1-2 - Rectifier Heater
T1-3 - Rectifier Heater
T1-4 - B+ Supply
T1-5 - B+ Supply
T1-6 - Heater Supply
T1-7 - Heater Supply
T1-8 - Heater Supply Center Tap
R4 - Right Positive Input
R5 - Right Negative Input
T2-1 - Right B+ Supply to Output Transformer
T2-2 - Right Plate to Output Transformer
L4 - Left Positive Input
L5 - Left Negative Input
T3-1 - Left B+ Supply to Output Transformer
T3-2 - Left Plate to Output Transformer
I think that's all of 'em..
-Steve
Thank you Steve. Very much appreciated. I guess the Tubelab site lost some things in the transition to a new server.
Thanks Steve, Sitting down now with the transformers and schematic and trying to fathom it out, may still have some other dumb questions to follow though.
Steve or anyone with the patience to help. I have used the info below, searched the site and scoured for information on PT and OPT hook ups and come up with nothing specific. So i am taking the following stab in the dark and hope fully some one can tell me if I have it wrong. I am using a hammond 276X transformer and James 6123HS OPT. Setting it up for 300B.
One last thing i notice there is no fuse what would you advise?
Many thanks
Connections:
T1-1 - B+ Supply Center Tap Red/yellow
T1-2 - Rectifier Heater yellow 5V
T1-3 - Rectifier Heater Yellow 5V
T1-4 - B+ Supply Red 346V
T1-5 - B+ Supply Red 346V
T1-6 - Heater Supply Green 6.3V
T1-7 - Heater Supply Green 6.3V
T1-8 - Heater Supply Center Tap Green/Yellow (I read the schematic as T1-6 as center tap is this correct?)
R4 - Right Positive Input
R5 - Right Negative Input
T2-1 - Right B+ Supply to Output Transformer B 450V
T2-2 - Right Plate to Output Transformer 3.5K
L4 - Left Positive Input
L5 - Left Negative Input
T3-1 - Left B+ Supply to Output Transformer B 450V
T3-2 - Left Plate to Output Transformer 3.5K
I am assuming the speakers would just run from the 0 and 8 Ohm from OPT?
One last thing i notice there is no fuse what would you advise?
Many thanks
Connections:
T1-1 - B+ Supply Center Tap Red/yellow
T1-2 - Rectifier Heater yellow 5V
T1-3 - Rectifier Heater Yellow 5V
T1-4 - B+ Supply Red 346V
T1-5 - B+ Supply Red 346V
T1-6 - Heater Supply Green 6.3V
T1-7 - Heater Supply Green 6.3V
T1-8 - Heater Supply Center Tap Green/Yellow (I read the schematic as T1-6 as center tap is this correct?)
R4 - Right Positive Input
R5 - Right Negative Input
T2-1 - Right B+ Supply to Output Transformer B 450V
T2-2 - Right Plate to Output Transformer 3.5K
L4 - Left Positive Input
L5 - Left Negative Input
T3-1 - Left B+ Supply to Output Transformer B 450V
T3-2 - Left Plate to Output Transformer 3.5K
I am assuming the speakers would just run from the 0 and 8 Ohm from OPT?
All of those connections look correct - I was incorrect. T1-6 is the heater CT. Will ask the mods to change my previous post.
Last edited:
Install a fuse at least one on the AC line coming in after the IEC and before the power switch only need on one leg of the AC. It may even save you and your gear someday!
cheers,
Bob
cheers,
Bob
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