Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: mresistor on July 24, 2020, 03:03:47 pm

Title: Magnatone 431, Estey T-32 reverb pan specs help
Post by: mresistor on July 24, 2020, 03:03:47 pm: Ran across a Magnatone 431 / Estey T-32 that has seen better days. Pulled the reverb pan and the two springs were totally missing. It seems to be the original reverb pan though because of the way it is mounted and the foam spacers still attached to the pan and the mount bracket. The input transducer was lying on the bottom of the cabinet. Measuring dc resistance is going to be a challenge as the tiny copper wires are broken up to the coil. The output dc resistance I measured at 850 ohms. Its a Gibbs pan with a Printed C inside the pan. No other markings.
Can anyone with more experience with these amps help out? Does anyone know what the specs are already? Or a suitable replacement. Here is the schematic .

Mods might consider adding it to the library as this one is very readable. https://www.magnatoneamps.com/schematics/magnatone_431_dg.jpg (https://www.magnatoneamps.com/schematics/magnatone_431_dg.jpg)

I really appreciate any help offered .. thank you in advance.
Title: Re: Magnatone 431, Estey T-32 reverb pan specs help
Post by: sluckey on July 24, 2020, 03:14:33 pm: Another member just finished a project that uses that same reverb circuit and tank. He used a modern Accutronics replacement with good results. The actual part number is in this thread...

https://el34world.com/Forum/index.php?topic=25746.0
Title: Re: Magnatone 431, Estey T-32 reverb pan specs help
Post by: mresistor on July 24, 2020, 03:38:21 pm: Looks like the 4FB3A1B is the ticket then . Both input and output sleeves grounded - and that's what this tank has..

Thank you Steve..
Title: Re: Magnatone 431, Estey T-32 reverb pan specs help
Post by: mresistor on August 06, 2020, 04:39:22 pm: Received the new reverb tank, hooked it up and it works great! Thanks again Steve ! :icon_biggrin: