old 220w original NRG help plz

verticalvince · Post by **verticalvince** » Sun Apr 12, 2015 9:30 pm

Hi guys trying to help new member the producer who needs help with an old original nrg 220w parts and info thanks

verticalvince · Post by **verticalvince** » Sun Apr 12, 2015 9:32 pm

Hi guys trying to help new member the producer who needs help with an old original nrg 220w parts and info thanks also any diagrams or related info

s2000 · Post by **s2000** » Sun Apr 12, 2015 10:25 pm

All I can remember about that amplifier is that it used a THA15/SD1726 transistor...

verticalvince · Post by **verticalvince** » Sun Apr 12, 2015 10:54 pm

Think albert if around will have the knoll for thos one same person needs help with toroidal psu parts has pics just waiting on his membership apprpval

theproducer · Post by **theproducer** » Mon Apr 13, 2015 1:44 pm

s2000 wrote:All I can remember about that amplifier is that it used a THA15/SD1726 transistor...

yep thats right i have two of them to re build

theproducer · Post by **theproducer** » Mon Apr 13, 2015 1:46 pm

lol good old uncle Albert where are you

theproducer · Post by **theproducer** » Mon Apr 13, 2015 1:48 pm

and also the
40 watt power amplifier wiring/schematics components list
stereo encoder (mpx) wiring/schematics components list

theproducer · Post by **theproducer** » Mon Apr 13, 2015 1:50 pm

theproducer wrote:
s2000 wrote:All I can remember about that amplifier is that it used a THA15/SD1726 transistor...
yep thats right i have two of them to re build

plus i want the components list for the 28v circuits as well
i know its a relay zenner diodes some resistors n one or two more bits

theproducer · Post by **theproducer** » Mon Apr 13, 2015 2:00 pm

power regulator board 4.jpg

theproducer wrote:
theproducer wrote:
s2000 wrote:All I can remember about that amplifier is that it used a THA15/SD1726 transistor...
yep thats right i have two of them to re build
plus i want the components list for the 28v circuits as well
i know its a relay zenner diodes some resistors n one or two more bits

theproducer · Post by **theproducer** » Mon Apr 13, 2015 2:02 pm

[quote="theproducer"]

power regulator board 4.jpg

[quote="theproducer"][quote="theproducer"][quote="s2000"]All I can remember about that amplifier is that it used a THA15/SD1726 transistor...
yep thats right i have two of them to re build plus i want the components list for the 28v circuits as well
i know its a relay zenner diodes some resistors n one or two more bits and the wiring for the toroidal transformer from the ac and to the board

s2000 · Post by **s2000** » Mon Apr 13, 2015 2:49 pm

Wow not seen one fo those for a while

When you say rebuild them, what's actually wrong with them?

theproducer · Post by **theproducer** » Mon Apr 13, 2015 8:37 pm

s2000 wrote:Wow not seen one fo those for a while When you say rebuild them, what's actually wrong with them?

i need the components list and what parts i need for the 28v side

theproducer · Post by **theproducer** » Mon Apr 13, 2015 8:38 pm

theproducer wrote:
s2000 wrote:Wow not seen one fo those for a while When you say rebuild them, what's actually wrong with them?
i need the components list and what parts i need for the 28v side

iv managed to find someone to clone the board as the copper on the bottoms gone

sinus trouble · Post by **sinus trouble** » Tue Apr 14, 2015 12:42 am

Hello producer!

maybe you could get in touch with the new owners of NRG? nrg NZ or nrg UK? they may have some
of steve moss's old designs?
To me that looks over complicated for just a PSU? theres more going on? protection circuits possibly? i dont know what you mean by the copper has all gone?? but anyone competent in electronics could easily do a repair!

theproducer · Post by **theproducer** » Tue Apr 14, 2015 8:41 am

sinus trouble wrote:Hello producer!
maybe you could get in touch with the new owners of NRG? nrg NZ or nrg UK? they may have some
of steve moss's old designs?
To me that looks over complicated for just a PSU? theres more going on? protection circuits possibly? i dont know what you mean by the copper has all gone?? but anyone competent in electronics could easily do a repair!

the copper circuit board iv managed to locate someone to clone the board

theproducer · Post by **theproducer** » Tue Apr 14, 2015 8:51 am

theproducer wrote:
sinus trouble wrote:Hello producer!
maybe you could get in touch with the new owners of NRG? nrg NZ or nrg UK? they may have some
of steve moss's old designs?
To me that looks over complicated for just a PSU? theres more going on? protection circuits possibly? i dont know what you mean by the copper has all gone?? but anyone competent in electronics could easily do a repair!
the copper circuit board iv managed to locate someone to clone the board

with renewing parts the copper has co,e off the bottom of the circuit board

sinus trouble · Post by **sinus trouble** » Wed Apr 15, 2015 12:33 am

Judging by your pics? it looks like youve had a blowout around the fuseholder? which indicates under fault conditions the incorrect fuse has been used instead of rectifying the main fault? causing stress on the tracks of the PCB! I would recommend disconnecting the amplifier and other parts connected to the PSU outputs to verify that the PSU is operating as it should!

theproducer · Post by **theproducer** » Thu Apr 16, 2015 5:29 pm

it was the relay that went i also replaced the fuse

i know have 4 boards the same for one of my m8's @ kanga-produts and looks like setve moss was working on the 28 volt side as well as the power for the pll/vfo side some strange mind steve moss had onwards and upwards going to test them tomorrow on all circuits 12v 50 v and the 28v hers hopping it goes well

sinus trouble · Post by **sinus trouble** » Thu Apr 16, 2015 11:28 pm

hello again producer!

that is just an amplifier you have? and not a complete transmitter by the look of it? But steve had big plans for NRG! so it is quite likely that he would produce a PSU PCB universally suited for all his transmitters! unfortunately we only got to see the tip of the iceberg as they say!

anyways its likely that the output is causing the problems? apart from any obvious faults? if i was you? id power up the PA from an external current protected PSU on its lonesome to check for faults! ive never used the output device in question? but it should not draw anymore than 5amp @ 50v?

s2000 · Post by **s2000** » Sat Apr 18, 2015 1:29 pm

From what I remember the SD1726 was a similar device to the SD1407, it was actually a 30Mhz device that happened to work ok @ 100Mhz and had useful gain and was dirt cheap. NRG used to sell them on their website for about £30 but if you sourced them out yourself they could be had for much cheaper..

The main drawback was they needed a high amount of drive for 220W out, around 35w, I guess that made it a good amp to follow the NRG 40watt amp...

Also as with the SD1407, its not very efficient, you would need a large current draw to power it to 220W, I would imagine it would need 7-9 amp power supply @50V (assuming 50-60% efficiency)..

Got any pics of the amp? Would be nice to see this beast again

old 220w original NRG help plz

old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz

Re: old 220w original NRG help plz