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Can I tag in on this field-coil speaker issue?
Background is I have abandoned a PA amp conversion in favor of this conversion, which includes 4 12" field-coil speakers from a Hammond tone cabinet.
I have 1 Hammond type H power amp (quad 6v6) ready to run 2 of the field coil speakers, a 250 ohm and a 5000 ohm pair, as originally designed. This power amp is going to require a high-level preamp to run, so I have an amp from a Baldwin (quad 12ax7, quad 6bq5, and a 5u4gb) that I can convert into a Hoffman AC-30 layout, ad spring reverb.
So, I got to get the AC-30 layout to run the other pair of field coil speakers, instead of PM speakers. The fact that the pair came with two diferrent field coil resistances really complicates things for me.
The other side issue being how to power the Type H power amp as a bi-amp. I'm thinking I could use the driver side of a second spring reverb circuit. The big picture is to have a 4-12 combo amp that runs 2-12s from the AC-30 and an on/off/master to add the quad 6V6 amp and remaining pair of 12s.
Background is I have abandoned a PA amp conversion in favor of this conversion, which includes 4 12" field-coil speakers from a Hammond tone cabinet.
I have 1 Hammond type H power amp (quad 6v6) ready to run 2 of the field coil speakers, a 250 ohm and a 5000 ohm pair, as originally designed. This power amp is going to require a high-level preamp to run, so I have an amp from a Baldwin (quad 12ax7, quad 6bq5, and a 5u4gb) that I can convert into a Hoffman AC-30 layout, ad spring reverb.
So, I got to get the AC-30 layout to run the other pair of field coil speakers, instead of PM speakers. The fact that the pair came with two diferrent field coil resistances really complicates things for me.
The other side issue being how to power the Type H power amp as a bi-amp. I'm thinking I could use the driver side of a second spring reverb circuit. The big picture is to have a 4-12 combo amp that runs 2-12s from the AC-30 and an on/off/master to add the quad 6V6 amp and remaining pair of 12s.
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