Sigh; So I was in Goodwill warehouse sales the other day, not even for 5 mins and even though I'd never seen one first hand before I immediately recognized a big cabinet as being something to do with a Hammond Organ. Even though someone had already swiped the tubes out of it in the retail store I figured: For $20.00 how could I go wrong. Well, I've been at this now for about close to six years so I've already got enough chassis parts and pieces to build what ever I want. More chassis parts pieces; That's how I could go wrong. I've already gotten $20.00 worth of satisfaction and knowledge base research out of it.... Now what? The speakers look good. I can't imagine building something with the power transformer. This is only a 40 watt cabinet but has an external feed for other power amps according to the inside label. It's a Dual Rectifier power supply. About 100 Watts. 220 Watts input.
The 15" speakers are Jensen P15N Mfg. possibly in March of 69. 220903 is the EIA code. The 12" speakers are Rola's perhaps Mfg. in 68. I'm unable to determine the power ratings of the speakers. Another question I have: I've blown Organ speakers before playing the guitar through them. Are these even going to handle a raw guitar sound at their rated power?
I can't think of any use for the amp chassis so now I'm trying to figure out what to do with it. It's like finding a puppy- Don't. You can't take it to the pound so you're stuck until you either keep it or give it away. Although I don't think I'll just give away the speakers. Maybe use the speakers to build a complete amp and try to sell it.
The existing amp is basically unusable due to the fact it takes a high level signal input and there's no pre circuitry. Interesting fact though, the design separates the Treble and Bass into two channels. There's also a Reverb unit- with dangling stretched springs.... Perhaps I could use the cabinet as a Giant Plant Stand.
Any idea on the power rating of the speakers?
colorcat.
The 15" speakers are Jensen P15N Mfg. possibly in March of 69. 220903 is the EIA code. The 12" speakers are Rola's perhaps Mfg. in 68. I'm unable to determine the power ratings of the speakers. Another question I have: I've blown Organ speakers before playing the guitar through them. Are these even going to handle a raw guitar sound at their rated power?
I can't think of any use for the amp chassis so now I'm trying to figure out what to do with it. It's like finding a puppy- Don't. You can't take it to the pound so you're stuck until you either keep it or give it away. Although I don't think I'll just give away the speakers. Maybe use the speakers to build a complete amp and try to sell it.
The existing amp is basically unusable due to the fact it takes a high level signal input and there's no pre circuitry. Interesting fact though, the design separates the Treble and Bass into two channels. There's also a Reverb unit- with dangling stretched springs.... Perhaps I could use the cabinet as a Giant Plant Stand.
Any idea on the power rating of the speakers?
colorcat.
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This is a Hammond tone cabinet. Possibly PR40 or HR40, I'm not really up on the single channel ones.
I'd say the speakers are rated about 30 watts or less. Hammond was a big enough customer, they got exactly what they wanted from the manufacturers. Nothing in excess.
These speakers are quite durable on sine waves at their rated wattage. My Rolas are going into their 5th decade with no rubber surround problems, even though I've got the amps back to the full rated output wattage, and maybe a little higher.
The schematic will be on captain-foldback.com under tone cabinets.
Organs typically can play rated volume on one note, say a bass note. But that note will be a sine wave. Crunch guitar has lots of energy in overtones, and can melt coils even on guitar rated speakers. See the White Paper about peavey speaker design on peavey.com, and the "DDT" circuit he put in his amps to turn down the volume from the input as the overtone level went up due to waveshape`.
Keep aware, bass volume has something to do with cabinet size. These things are big for a reason. Yeah, ports and folded soundpaths can collapse the volume required for a volume, at the risk of different time delays for the different frequencies. These are made to have a perforated wood back on them for best bass reflex effect.
Have fun.
I'd say the speakers are rated about 30 watts or less. Hammond was a big enough customer, they got exactly what they wanted from the manufacturers. Nothing in excess.
These speakers are quite durable on sine waves at their rated wattage. My Rolas are going into their 5th decade with no rubber surround problems, even though I've got the amps back to the full rated output wattage, and maybe a little higher.
The schematic will be on captain-foldback.com under tone cabinets.
Organs typically can play rated volume on one note, say a bass note. But that note will be a sine wave. Crunch guitar has lots of energy in overtones, and can melt coils even on guitar rated speakers. See the White Paper about peavey speaker design on peavey.com, and the "DDT" circuit he put in his amps to turn down the volume from the input as the overtone level went up due to waveshape`.
Keep aware, bass volume has something to do with cabinet size. These things are big for a reason. Yeah, ports and folded soundpaths can collapse the volume required for a volume, at the risk of different time delays for the different frequencies. These are made to have a perforated wood back on them for best bass reflex effect.
Have fun.
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