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Old 1st April 2011, 06:09 PM   #1
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Default OT as buffer?

I had an idea this morning.

Would I be able to use a small output transformer instead of a tube buffer in a bass guitar preamp I am building?

Would I be able to achieve an ultra low impedance at the preamps output?

Would I be able to saturate the OT to get some interesting tones when I overdrive the pre?

Thanks for all your help!

Last edited by bill mountain; 1st April 2011 at 06:13 PM.
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Old 1st April 2011, 08:53 PM   #2
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Sure, here's one designed for the task: EDCOR Electronics Corporation. XSM15K/600 They have others for 15K:150ohm if you want to go lower than line-level.
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Old 1st April 2011, 08:58 PM   #3
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Quote:
Originally Posted by andrew_k View Post
Sure, here's one designed for the task: EDCOR Electronics Corporation. XSM15K/600 They have others for 15K:150ohm if you want to go lower than line-level.

Thanks for the hot tip!

I checked Jensen and Lundhal. I always forget about Edcor!
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Old 2nd April 2011, 03:30 PM   #4
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I think I'm going to go this route. That Edcor is pretty cheap so If it doesn't work out for me it won't be a huge waste of money.

I have one last question that I can't find the answer to here or with google.

If I put the master volume pot after the transformer (so I can attempt to get some saturation in the the tranny) how do I calculate my actual output impedance. I believe the pot will affect is some how.

Thanks!
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Old 2nd April 2011, 04:53 PM   #5
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Quote:
Originally Posted by bill mountain View Post
Would I be able to achieve an ultra low impedance at the preamps output?


No idea what is your definition for "ultra low impedance" but it's not likely you will be able to achieve this using a transformer, even with a step-down. A pot at the output will make it a lot worse.
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Old 2nd April 2011, 10:19 PM   #6
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I guess ultra low impedance would be like an opamp. I thought maybe using a transformer could get me in the same ballpark. A cathode follower will work fine but I was looking for something to experiement with.
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