Hello!
I purchased a DAC Sony DAS 702es, which needed a little encouragement to successfully reproduce the sound, it was solved after replacing a tension stabilizer ... sometimes the situation is easier to solve than it seems ... you should not give up too easily!
Then I noticed that a light bulb is burned out, more precisely: "PL 804 indicating the frequency 44khz, the light bulb model being: "1-518-518-41".
According to the diagram, which I attach to this message, the light bulb has 8V.
The problem it is not clear from the diagram of the manual what amperage this bulb has, and the model is no longer produced so I can access its technical sheet. Does anyone have any idea what amperage it has, and possibly what amperage the other bulbs have in the diagram?
Thank you!
I purchased a DAC Sony DAS 702es, which needed a little encouragement to successfully reproduce the sound, it was solved after replacing a tension stabilizer ... sometimes the situation is easier to solve than it seems ... you should not give up too easily!
Then I noticed that a light bulb is burned out, more precisely: "PL 804 indicating the frequency 44khz, the light bulb model being: "1-518-518-41".
According to the diagram, which I attach to this message, the light bulb has 8V.
The problem it is not clear from the diagram of the manual what amperage this bulb has, and the model is no longer produced so I can access its technical sheet. Does anyone have any idea what amperage it has, and possibly what amperage the other bulbs have in the diagram?
Thank you!
Lamps don't exactly have amperage. They do have resistance, which is nonlinear with filament temperature. The resistors shown in the schematic limit current through the lamps to run that at reduced voltage and current. If you want to know the current through a bulb that is on, you can measure the voltage drop across the series resistor and then use Ohms law to find the current.
Anyway, given that the last two digits of the part number were 41, maybe they are #41 pilot lamps?
Do they look like the ones at: https://www.ebay.com/itm/3028748230...6e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c
Also, sometimes a number is printed on the bulb somewhere, maybe on the base, sometimes on the glass. If so in this case, that might be helpful to know.
Anyway, given that the last two digits of the part number were 41, maybe they are #41 pilot lamps?
Do they look like the ones at: https://www.ebay.com/itm/3028748230...6e08cd7450cbbdddc64c6cf2e8891f6d48747c6d56d2c
Also, sometimes a number is printed on the bulb somewhere, maybe on the base, sometimes on the glass. If so in this case, that might be helpful to know.
In the link below the lamp is identified as 14V 80mA. It is fairly common to run these lamps undervoltage to extend their life.
https://www.tapeheads.net/threads/sony-ta-f700es-green-lamp-specs.81073/
You can get the lamps (CM2182) here:
https://www.digikey.com/en/products/detail/visual-communications-company-vcc/2182/3151196
https://www.mouser.com/ProductDetail/VCC/2182?qs=qp111mKzDjiVYVHkr2YleQ==
https://www.tapeheads.net/threads/sony-ta-f700es-green-lamp-specs.81073/
You can get the lamps (CM2182) here:
https://www.digikey.com/en/products/detail/visual-communications-company-vcc/2182/3151196
https://www.mouser.com/ProductDetail/VCC/2182?qs=qp111mKzDjiVYVHkr2YleQ==
Thank you for the answer!
The bulb is, in fact, a mini bulb, whose values I managed to find out, with the help of Mr. David Wojnarowski who advised me, describing in great detail, exemplifying with the help of images, the steps that made it possible to find out its values.
It turned out that the bulb is 9V and an amperage of 0.72mA.
Thank you very much to Mr. Wojnarowski! but also to the other contributors to the topic!
The bulb is, in fact, a mini bulb, whose values I managed to find out, with the help of Mr. David Wojnarowski who advised me, describing in great detail, exemplifying with the help of images, the steps that made it possible to find out its values.
It turned out that the bulb is 9V and an amperage of 0.72mA.
Thank you very much to Mr. Wojnarowski! but also to the other contributors to the topic!
Attachments
9V and 72mA is an unusual combination, not in the Chicago Miniature Lamp catalog. How were these numbers determined? Where would you buy a lamp with these specs?
Hello Bill_P!
connect a multimeter in parallel to measure the voltage drop across a lightbulb, and for establishing the amperage image below.
As for the source for such bulbs, there are actually several sources, I live in Europe, here such bulbs are still produced, especially for car dashboards ... but there are also Chinese sources, the Chinese being the ones who save at least one a quarter of the planet's population that does nothing ... waiting for social assistance ... no offense 🙂
The available values, the most suitable for this situation, are 9V 70mA bulbs.
connect a multimeter in parallel to measure the voltage drop across a lightbulb, and for establishing the amperage image below.
As for the source for such bulbs, there are actually several sources, I live in Europe, here such bulbs are still produced, especially for car dashboards ... but there are also Chinese sources, the Chinese being the ones who save at least one a quarter of the planet's population that does nothing ... waiting for social assistance ... no offense 🙂
The available values, the most suitable for this situation, are 9V 70mA bulbs.
