Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: mike123 on July 30, 2017, 04:48:56 pm
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Hi all, I'm building a Princeton Reverb (AA1164 circuit).
The 022921 reverb transformer from Hoffman Amplifiers has an input Z of 14500 ohms input & an output Z of 4 ohms.
The Mojo 4AB3C1B tank from Hoffman has an input Z of 8 ohms.
Googling around it appears that the typical Fender 022921 reverb transformer has an input Z of about 25K ohms & an output Z of 8 ohms.
What will be the effect of this Z mismatch be on my reverb?
Cheers
Mike
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What will be the effect of this Z mismatch be on my reverb?
There is no impedance mismatch. 25K : 8 is almost the same ratio as 14.5K : 4 and it turns out that this is how output transformers work.
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I think Mike mean which will be the effect of mismacth using the 14500/4 ohm transformer with a load of 8 ohm
14500 x 2 = 29000 ohm
so 29000 ohm primary instead of 25000 primary
I think he will reach only a bit lower strongness of the signal, but probably no other negative effects
Franco
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I think Mike mean which will be the effect of mismacth using the 14500/4 ohm transformer with a load of 8 ohm
14500 x 2 = 29000 ohm
so 29000 ohm primary instead of 25000 primary
I think he will reach only a bit lower strongness of the signal, but probably no other negative effects
Probably it.
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Thanks all for the input. The amp build is now complete & the reverb sounds lush!
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The amp build is now complete & the reverb sounds lush!
Nice :smiley:
but ...... with wich configuration for the reverb transformer + tank ?
Franco
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With the "mismatched" tank.