opt has in oilbox (3kV), and this one is not..😕
Those links are just similar rating examples - obviously a lot easier to start with most of the amp if one is keen, compared to starting with just an output transformer!
Anatoliy, what would be the actuators for that?
Jan
Hi Johannes;
about a month ago somebody tried to sell a complete amp on eBay; it was discussed in Vacuum Tubes group on Fece Book, and we found that the amp was made for marine purposes. I am not sure about sonars.
Spotted this bad boy while browsing Ebay. 5000 Watt Audio Output Transformer Tube Amplifier AM Transmitter 4CX3000A
I bet George could find some uses!
That's a great transformer you found but it's unfortunately cuts off at 3000cps which is what we ham operators use to modulate our AM transmitters. You typically need 50% audio power of what your Rf carrier is to have full efficiency. So basically that transformer went in a 10kw AM transmitter used by an AM radio station..It would be a nice thought tho,5000w of audio at 20 to 20khz.
"unfortunately cuts off at 3000cps which is what we ham operators use to modulate our AM transmitters"
Where do you see that?
The listing says: Frequency response: 100Hz - 50KHz
The output impedance is too low (256 Ohm max) for an AM modulator too, unless it strangely used SS finals.
If it came off a ship, it must have been a cruise ship, with that 60 Hz 3 phase power transformer for it. Giant Musak/intercom maybe.
High Voltage Plate Transformer 4CX3000A Pair | eBay
Where do you see that?
The listing says: Frequency response: 100Hz - 50KHz
The output impedance is too low (256 Ohm max) for an AM modulator too, unless it strangely used SS finals.
If it came off a ship, it must have been a cruise ship, with that 60 Hz 3 phase power transformer for it. Giant Musak/intercom maybe.
High Voltage Plate Transformer 4CX3000A Pair | eBay
Last edited:
On the other hand, the strapping on the OT is set up for the 256 OHM output, which would have up to 1000 VAC across it. Definitely not suitable for a sound distribution system.
When all other possibilities have been eliminated, the remaining one must be it. I guess it would be SONAR for a cruise ship that has 60 Hz 3 phase power available. (all those TV sets and hair dryers to operate)
Surprising the xfmrs are not sealed units though, for use on a ship.
Ehh, the Titanic control room would never get wet..... Hurricanes don't bother these big ships..... El Sinko
When all other possibilities have been eliminated, the remaining one must be it. I guess it would be SONAR for a cruise ship that has 60 Hz 3 phase power available. (all those TV sets and hair dryers to operate)
Surprising the xfmrs are not sealed units though, for use on a ship.
Ehh, the Titanic control room would never get wet..... Hurricanes don't bother these big ships..... El Sinko
Last edited:
Ehh, the Titanic control room would never get wet..... Hurricanes don't bother these big ships.....
Speaking of control rooms... Queen Mary 😀
An externally hosted image should be here but it was not working when we last tested it.
Which Vacuum Tubes group on FB?Hi Johannes;
about a month ago somebody tried to sell a complete amp on eBay; it was discussed in Vacuum Tubes group on Fece Book, and we found that the amp was made for marine purposes. I am not sure about sonars.
From the Q&A section below the Ebay amplifier listing:
"The unit was used by a university research lab years ago and then put in storage when they got a solid state unit."
I also noticed that the freq. response for the amplifier is given as 100 Hz to 10 KHz. (not the 50 KHz given in the listing for the 200 LB OT) Although the manufacturer's listing states that custom models are available up to 200 KHz. So who knows.
"The unit was used by a university research lab years ago and then put in storage when they got a solid state unit."
I also noticed that the freq. response for the amplifier is given as 100 Hz to 10 KHz. (not the 50 KHz given in the listing for the 200 LB OT) Although the manufacturer's listing states that custom models are available up to 200 KHz. So who knows.
- Status
- Not open for further replies.
- Home
- Amplifiers
- Tubes / Valves
- Now THIS is an output transformer