I have a Lafayette amplifier model LA-475. Anyone know what best speaker impedance I should use? I would assume an 8 Ohm load, but I'm not sure; I've seen other Lafayette models where it is matched for a 4 Ohm load. I'm assuming this is a fixed current amp, not a fixed voltage. Anyone know? Thanks for any help!!!
Lafayette LA-475
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Let's say I HAD to use a 4 Ohm speaker, could I place a 4 Ohm resistor in series. One that could dissapate a lot of heat? Sorry, I have questions because I haven't dealt much with amplifiers in general; I'm just kind of going off of the little electrical knowledge I have. My friend is a musician, and it's his amp. He just gave it to me to mess around with. Thanks again!!
mhardy6647
Lunatic Member
Actually in the early 1970s (pre-FTC) it was very common for the massmarket manufacturers/distributors to quote power output into a 4 ohm load for solid state equipment. The reason was the same as today - a higher number! 
Implicit in the specs would be 4-ohm stability but it's probably worth being cautious.
I can check my old LRE catalogs tonight; the LA-475 isn't one I remember per se (I am guessing it's a quad amp given the "4" in the model number?).
Implicit in the specs would be 4-ohm stability but it's probably worth being cautious.
I can check my old LRE catalogs tonight; the LA-475 isn't one I remember per se (I am guessing it's a quad amp given the "4" in the model number?).
Yes, it has 2 front/main speakers and 2 rear/remote speakers. The main speakers have a terminal block, while the remote speakers are rca plugs. It has 4 rca inputs: tape rec/aux/tuner/phono. the phono has a magnetic/ceramic switch. AND there is an un-switched 300 watt power out and a switched 200 watt power out.
Knobs on the front are input selector, master volume, balance, bass, treble, and an output selector. 1/4" headphone jack. and 3 push button toggles for stereo/mono, hi fil, and loud. and one little red power light.
It's pretty sweet. I can't wait to hear the tone of this thing. One of the best moments of my childhood is sneaking into my sister's room and playing 2112 on her panasonic quad speaker (vinyl of course.) Twilight Zone sounded so perfect; acoustic and electric guitars, with the bass!!! You don't get tones like that anymore with every release being compressed to the max...
Knobs on the front are input selector, master volume, balance, bass, treble, and an output selector. 1/4" headphone jack. and 3 push button toggles for stereo/mono, hi fil, and loud. and one little red power light.
It's pretty sweet. I can't wait to hear the tone of this thing. One of the best moments of my childhood is sneaking into my sister's room and playing 2112 on her panasonic quad speaker (vinyl of course.) Twilight Zone sounded so perfect; acoustic and electric guitars, with the bass!!! You don't get tones like that anymore with every release being compressed to the max...
mhardy6647
Lunatic Member
I checked a 1973 LRE catalog late last night (from the halcyon years of quad!) and didn't see this amp. I'll keep looking.
mhardy6647
Lunatic Member
We try to keep it quiet ;-)
I checked the '74 LRE catalog last night and also came up blank. I don't suppose you could post a photo of the amp sometime? I'd like to find original specs for it, just to see if it included a 4-ohm power rating (I suspect it did, but it'd be interesting to know for sure).
Na'ah, we're all socially dysfunctional, here! Well, OK, maybe just me...
I checked the '74 LRE catalog last night and also came up blank. I don't suppose you could post a photo of the amp sometime? I'd like to find original specs for it, just to see if it included a 4-ohm power rating (I suspect it did, but it'd be interesting to know for sure).
Na'ah, we're all socially dysfunctional, here! Well, OK, maybe just me...
mhardy6647
Lunatic Member
I'll check tonight!
It's still bugging me that I am drawing a blank on the OP's amplifier...
Pics!
Here are some pictures of the amp. I'm talking about. this same amp is for sale on craigslist in virgina or somewhere I can't remember right now. my right channel pops and cracks when I connect a speaker, even with nothing on the inputs... I took the case apart, but don't see any physical damage to any parts...I am assuming the output transistors are the ones that are screwed to the heat-sink, but not sure...thanks again!
Here are some pictures of the amp. I'm talking about. this same amp is for sale on craigslist in virgina or somewhere I can't remember right now. my right channel pops and cracks when I connect a speaker, even with nothing on the inputs... I took the case apart, but don't see any physical damage to any parts...I am assuming the output transistors are the ones that are screwed to the heat-sink, but not sure...thanks again!
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getright99
least likely to succeed
I know this is an old thread but this is the amp I currently use. Nothing special, I'm assuming a 10-12 watt integrated. Tiny amp, about 12x9x4. As of right now I have both fuses wrapped in tinfoil just waiting for it to give up the ghost.