Yamaha A760's specifications
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Yamaha A760 specs
THD: 0.01%
IM distortion: (60/7000 Hz) 8 Ohm rated output 0.002%
Signal/noise ratio(line input): 103dB (aux) , 98dB Phono MM (10mV) , 76dB Phono MC (500µV)
frequency response(line input): 8 Ohm rated output 10-50,000Hz
Nice Intregrated amp, except for the bulbs in the lighted buttons.
THD: 0.01%
IM distortion: (60/7000 Hz) 8 Ohm rated output 0.002%
Signal/noise ratio(line input): 103dB (aux) , 98dB Phono MM (10mV) , 76dB Phono MC (500µV)
frequency response(line input): 8 Ohm rated output 10-50,000Hz
Nice Intregrated amp, except for the bulbs in the lighted buttons.
nkrisher@hot
New Member
Hey folks - I just resurrected my A760 from 20 years of storage. The unit still sounds great but those wonderful square buttons don't light up anymore. Any idea if there are replacement bulbs available?
nkrisher@hot
New Member
Thanks - I'm going to bring the amp in and give it a good cleaning/tune up. Hopefully they can replace the bulbs. I'm planning on setting up a turntable again for the first time in about 100 years & using this amp as the centerpiece for my "retro system"
Gigapod
Vintage audio amateur
It's a nice amp. You can check my webpage about it here:nkrisher@hot said:
http://gigapod.free.fr/Yamaha_A760.html
Some parts are unobtanium, so it's a fragile piece.
nkrisher@hot
New Member
Gigapod said:
Thanks for the info, I'm glad I found this forum. What are the chances that a competent repair tech that deals in older components can repair the lamps in my unit as you describe? Being non-savvy technically makes it hard for me to decipher what is a simple vs. complex process
I got this A760 amp new from a shop somewhere in NY state through a connection a best friend of mine had - my buddy was a true genius with electronics and has since passed away. I want to restore this piece as best as possible becasue it reminds me of him. I remember the shop said it had a "Carver" power supply.
Anyhow, I've got some other pieces from "back in the day" that I want to bring out of mothballs as well:
- Kenwood KD2055 belt drive turntable (w/ the "Concrete" base & charming cigarette burn in dustcover from college keg party)
- Kenwoood KD5100 direct drive table
- Luxman LV113 integrated
- Luxman D113-D CD player
Gigapod said:They are 14.5V 80mA bulbs. I have replaced one of mine with a white LED with a series resistor and a diode (20mA result), plus another 2W resistor in parallel to get the 80mA.
(edit)
Here is the relevant part of the schematics:
Please, I would appreciate greater detail in how you setup the LED. Such as what value resistor(s)? Thanks.
The originals are T1.25 pigtailed?
Gigapod
Vintage audio amateur
I added the LED circuit to the webpage.
The usual disclaimer follows:
This information is provided "as-is", without any guarantees.
ara: ara:
Only try this mod if you are an experienced electronics hobbyist and can correctly interpret the LED circuit schematic and the original Yamaha A-760 schematics.
If you don't feel comfortable with a soldering iron, I recommend you take your Yamaha unit to an experienced technician and have him do the work for you. :yes:
The usual disclaimer follows:
This information is provided "as-is", without any guarantees.
ara: ara:Only try this mod if you are an experienced electronics hobbyist and can correctly interpret the LED circuit schematic and the original Yamaha A-760 schematics.
If you don't feel comfortable with a soldering iron, I recommend you take your Yamaha unit to an experienced technician and have him do the work for you. :yes:
nkrisher@hot
New Member
Holy thread resurrection!
FYI - I turned on the A760 the other day and the glorious yellow and green buttons, previously dark, have returned to full fuctioning splendor!
Go figure. - I'm pleased - wonder how it happened & how long it might last??
:scratch2:
FYI - I turned on the A760 the other day and the glorious yellow and green buttons, previously dark, have returned to full fuctioning splendor!
Go figure. - I'm pleased - wonder how it happened & how long it might last??
:scratch2:
how the LED mod?
I am the original owner of the T-760 and A-760 since 1981.The T-760 blew the lamps six times since I own it. The RIFA .47uf X blew once.
I am interest with the LED mod bu Gigapod. I have couple of questions on the LED mod for those who had done it.
How is the LED circuit holding up after couple years?
Could the same LED mod used on the "Main" lamp bulb replacement as well??
BTW, has anyone use the A-960 10V 1w zener diode mod as per Yamaha Canada bulletin on a A-760 unit? if so, where would the zener and 22 ohm attached to in the A-760 control board. The drawing only pin location rather than the on a circuit.
BTW..I recall there is a bulletin on the A-760 that the 47 uf/25v cap for the DISC lamp been changed to 100uF/25v ..can some one confirm it? I had one cap blew as well previously
If the lamps are being run on AC, why is electrolytic be used?? It will blow the caps eventually.
Has anyone update the OP AMP to OPA2134AP ..is it s straight replacement?? Will I need to recalibrate the unit after replacement??
Any help on this is appreciated ?
I am the original owner of the T-760 and A-760 since 1981.The T-760 blew the lamps six times since I own it. The RIFA .47uf X blew once.
I am interest with the LED mod bu Gigapod. I have couple of questions on the LED mod for those who had done it.
How is the LED circuit holding up after couple years?
Could the same LED mod used on the "Main" lamp bulb replacement as well??
BTW, has anyone use the A-960 10V 1w zener diode mod as per Yamaha Canada bulletin on a A-760 unit? if so, where would the zener and 22 ohm attached to in the A-760 control board. The drawing only pin location rather than the on a circuit.
BTW..I recall there is a bulletin on the A-760 that the 47 uf/25v cap for the DISC lamp been changed to 100uF/25v ..can some one confirm it? I had one cap blew as well previously
If the lamps are being run on AC, why is electrolytic be used?? It will blow the caps eventually.
Has anyone update the OP AMP to OPA2134AP ..is it s straight replacement?? Will I need to recalibrate the unit after replacement??
Any help on this is appreciated ?
I did it
Anyway..I did it with the "Main Direct" bulb for the A760
I could not find the 3w 270 ohm.so I used the a 2watt. I used a 3.5V 20mA 5mm Warm White LED.
For those who wants to use the LED replacement in the future. While facing the A760 Amp from front, "left" side of the lamp wire connection ( or the metal jumper wire) is the positive or high side.
works good so far.
My "DISC" bulb is still original from 1981. :thmbsp:
Anyway..I did it with the "Main Direct" bulb for the A760
I could not find the 3w 270 ohm.so I used the a 2watt. I used a 3.5V 20mA 5mm Warm White LED.
For those who wants to use the LED replacement in the future. While facing the A760 Amp from front, "left" side of the lamp wire connection ( or the metal jumper wire) is the positive or high side.
works good so far.
My "DISC" bulb is still original from 1981. :thmbsp:
