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Re: Early Brunswick Electric Panatropes?
Posted: Fri Oct 08, 2021 3:04 pm
by howardpgh
When you say solid state preamp. Would that be like the RIAA preamp that you add to a modern turntable, or is it the FET replacement that is used in place of a triode tube?
Re: Early Brunswick Electric Panatropes?
Posted: Fri Oct 08, 2021 6:05 pm
by gunnarthefeisty
I'll ask!
Re: Early Brunswick Electric Panatropes?
Posted: Fri Oct 08, 2021 6:15 pm
by gunnarthefeisty
howardpgh wrote: Fri Oct 08, 2021 3:04 pm
When you say solid state preamp. Would that be like the RIAA preamp that you add to a modern turntable, or is it the FET replacement that is used in place of a triode tube?
ALTHOUGH, given that it's, well, a missing triode tube, it's probably the FET.
Re: Early Brunswick Electric Panatropes?
Posted: Fri Oct 08, 2021 9:10 pm
by pallophotophone
One other thing: If the "outboard " modern preamp has a phono input stage, then it is applying a RIAA curve to whatever signal is being applied to it. Basically cutting the HF response and boosting the bass. The inverse of the curve as applied to the original modern LP era recording. The response of the original magnetic pickup not withstanding, you will not have an accurate playback of the record- if it is an early electrical one- as long as that curve is being applied.
And unless the vintage magnetic pickup has an operating impedance that is very close to the modern 60's 70's magnetic cartridge impedances, that makes the situation even worse. That much I still remember accurately without fear of contradiction.
The designers of the early gear- no matter how basic it was- knew what they were doing when designing the playback chain. But still got the job done despite the "limitations".
Wasn't the primary benefit of a FET or MOSFET the way it functioned ? As close as you could come to a triode tube , but without all the high plate voltages, AC filament supplies, heat and finite life ?
Just thinking.. I didn't mean to go overboard.
Bob Hodge
Re: Early Brunswick Electric Panatropes?
Posted: Fri Oct 08, 2021 9:43 pm
by gunnarthefeisty
again, I'm almost certain it's an FET. Given that, as far as I can tell, it's more or less exactly what's missing, I don't see any reason why he'd put a modern RIAA pre-amp in there, he's not an idiot.
Re: Early Brunswick Electric Panatropes?
Posted: Sat Oct 09, 2021 3:11 pm
by electrolaman 64
Could you post a photo of the amplifier and over all back of your Panatrope?
Carlton Smith
Electrolaman 64
Indianapolis, IN
Re: Early Brunswick Electric Panatropes?
Posted: Sat Oct 09, 2021 4:54 pm
by gunnarthefeisty
electrolaman 64 wrote: Sat Oct 09, 2021 3:11 pm
Could you post a photo of the amplifier and over all back of your Panatrope?
Carlton Smith
Electrolaman 64
Indianapolis, IN
yeah, I will next time I go into the shop- keep in mind it's not mine, I'm only considering buying it.