Tannoy TS10 sub
** I have a Tannoy TS10 in for repair. The PSU switching FET (IRF740) is shorted so I expect the drive IC ( UC3842) is also dead. There appears to be NO source resistor with the FET for current sensing. The PSU produces a *single* DC rail for the bridge mode amplifier of about 140 volts - there is a 1000uF, 160V electro. I guess the speaker outputs rest at 0 volts and the DC rail electronically splits into +/- 70 volts. Question is, how in hell are only four *puny* TO220 mosfets supposed to form a bridged output stage and drive a 4 ohm woofer from such a supply voltage ? Looks to me like a real piece of Chinese ****. .... Phil |
Tannoy TS10 sub
"Phil Allison" wrote in message
... ** I have a Tannoy TS10 in for repair. The PSU switching FET (IRF740) is shorted so I expect the drive IC ( UC3842) is also dead. There appears to be NO source resistor with the FET for current sensing. The PSU produces a *single* DC rail for the bridge mode amplifier of about 140 volts - there is a 1000uF, 160V electro. I guess the speaker outputs rest at 0 volts and the DC rail electronically splits into +/- 70 volts. Question is, how in hell are only four *puny* TO220 mosfets supposed to form a bridged output stage and drive a 4 ohm woofer from such a supply voltage ? This page says it uses something called BASH, which I'd never heard of. http://www.samash.com/p/Tannoy_TS10%...ofer_-49998207 After much googling I found this: http://www.thompdale.com/bash_amplifier/bash_amp.htm Which suggests it does something similar to the Yamaha XM6150 I currently have waiting for parts. I don't see why a 160V rail is needed though. Old guy. Looks to me like a real piece of Chinese ****. .... Phil |
Tannoy TS10 sub
"John Smith" "Phil Allison" ** I have a Tannoy TS10 in for repair. The PSU switching FET (IRF740) is shorted so I expect the drive IC ( UC3842) is also dead. There appears to be NO source resistor with the FET for current sensing. The PSU produces a *single* DC rail for the bridge mode amplifier of about 140 volts - there is a 1000uF, 160V electro. I guess the speaker outputs rest at 0 volts and the DC rail electronically splits into +/- 70 volts. Question is, how in hell are only four *puny* TO220 mosfets supposed to form a bridged output stage and drive a 4 ohm woofer from such a supply voltage ? This page says it uses something called BASH, which I'd never heard of. http://www.samash.com/p/Tannoy_TS10%...ofer_-49998207 After much googling I found this: http://www.thompdale.com/bash_amplifier/bash_amp.htm Which suggests it does something similar to the Yamaha XM6150 I currently have waiting for parts. ** Thanks for going to all that trouble. There is indeed a switching regulator on the main DC output and the scheme is similar to the Klipsch one. ..... Phil |
Tannoy TS10 sub
Hi,
I'm looking for the schematics for the TS10 any help would be appreciated. thanks |
Tannoy TS10 sub
wrote in message ... Hi, I'm looking for the schematics for the TS10 any help would be appreciated. thanks What's the problem with it? Gareth. |
Tannoy TS10 sub
It turns on, but super low gain
What's the problem with it? Gareth. |
Tannoy TS10 sub
"Nestor Cano" wrote in message ... It turns on, but super low gain What's the problem with it? Gareth. That's really not a lot of information to go on. Good luck. Gareth. |
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