Hi All .
Just curious . Saw a 24V Zetagi B501P for sale . I was just wondering . Is it a lot of work to convert these down for 12V operation ?
Sammy
Converting a 24V amp to 12V
- cb4ever104
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Converting a 24V amp to 12V
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
- ch25
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Re: Converting a 24V amp to 12V
I suspect, that not much. 24V means 2x2 455's in series, need to be converted all paralel. Also bias circuit will need some work.
Chris
Chris
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- cb4ever104
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Re: Converting a 24V amp to 12V
Hi Chris .
OK . I wasn't sure if the 24V was maybe dropped to 12V within the amp first , but that doesn't seem to be the case . I thought both amps might share the same main pcb . I'll email Zetagi for the schematics to get a better look .
Cheers
Sammy
OK . I wasn't sure if the 24V was maybe dropped to 12V within the amp first , but that doesn't seem to be the case . I thought both amps might share the same main pcb . I'll email Zetagi for the schematics to get a better look .
Cheers
Sammy
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
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Re: Converting a 24V amp to 12V
There are plenty of power reducer units available on eBay, that might be your easiest and simplest solution.
- cb4ever104
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Re: Converting a 24V amp to 12V
Actually I'll need to increase my PSU output from 12V to 24V . Not decrease it . Saying that I'm not that keen on these kinds of units . I'd prefer to modify the amp if it wasn't a big job.
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
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Re: Converting a 24V amp to 12V
Modding a 24v amp to work properly on 12v is far from a small job,
24v Zetagi 2 transistor amps use the same pushpull configuration as the 12v amps but they use 28v transistors & run on 28v in a truck,
they usually have mrf422's or srfe1164's, also seen 2sc2510's & sd1407's in them but not from the factory,
different tuning, different components in the bias circuit, sometimes different value feedback components,
The later amps like zetagi b750 use b550 boards with a 78series regulator to run everything but the output transistors at 12v,
i think the older zetagis without the regulator used different resistors etc to work on 28v but its many years since i saw one.
24v Zetagi 2 transistor amps use the same pushpull configuration as the 12v amps but they use 28v transistors & run on 28v in a truck,
they usually have mrf422's or srfe1164's, also seen 2sc2510's & sd1407's in them but not from the factory,
different tuning, different components in the bias circuit, sometimes different value feedback components,
The later amps like zetagi b750 use b550 boards with a 78series regulator to run everything but the output transistors at 12v,
i think the older zetagis without the regulator used different resistors etc to work on 28v but its many years since i saw one.
W8JI
"An antenna with a poor ground using few radials cannot have a support mast grounded to the radial common point (at least it shouldn't if designed properly) There is no exception to this!
"An antenna with a poor ground using few radials cannot have a support mast grounded to the radial common point (at least it shouldn't if designed properly) There is no exception to this!
- cb4ever104
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Re: Converting a 24V amp to 12V
Cheers for that wa10 ! Well . Don't think I'll buy it then . Looks like way too much work
Sammy
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
- ch25
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Re: Converting a 24V amp to 12V
If you want to use it at home, just buy 24V PS
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- cb4ever104
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Re: Converting a 24V amp to 12V
Those nice people at Zetagi have told me that they only made a 24V of the 501 I thought there was a 12V version as well , but they should know
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.