337alant
Negatively Biased
My two transformers arrived today, Stephen sent me mine to check before he made the rest.
I wired them up and they are perfectly silent on my 242.5 Mains, I tried them on the 230, 240 & 250 setting and they were silent and don't get hot .
All secondary's are centre tapped except for the single 0-12
On 240VAC setting I got the following from each secondary
35VAC 1 = 36.6-0-36.6 (73.5) +4.5% unloaded
35VAC 2 = 36.6-0-36.6 (73.5) +4.5% unloaded
42VAC 1 = 43.5-0-43.5 (87.3) +3.6% unloaded
42VAC 2 = 43.5-0-43.5 (87.3) +3.6% unloaded
12VAC = 12.8V
On 230VAC setting I got the following from each secondary
35VAC 1 = 38-0-38 (76.4) +8.6% unloaded
35VAC 2 = 38-0-38 (76.4) +8.6% unloaded
42VAC 1 = 45.3-0-45.3 (90.9) +7.8% unloaded
42VAC 2 = 45.3-0-45.3 (90.9) +7.8% unloaded
12VAC = 13.3V
On 250VAC setting I got the following from each secondary
35VAC 1 = 35.2-0-35.2 (70.4) +0.5% unloaded
35VAC 2 = 35.2-0-35.2 (70.4) +0.5% unloaded
42VAC 1 = 41.7-0-41.7 (83.7) -0.7% unloaded
42VAC 2 = 41.7-0-41.7 (83.7) -0.7% unloaded
12VAC = 12.0V
So overall good readings the secondary's are very even and the regulation seems about right 4.5%
Ill try some loading tomorrow if I can find the right power resistors
My only comment is that the goss band is just slipped over the transformer and covered in red electricians tape ?
I asked for mine in clear tape and the ones I have had in the past the Goss band is under the final wraps of the clear tape .
I would also expect to see a sticker on there as well to show the secondary colour coding for future ref
Alan
I wired them up and they are perfectly silent on my 242.5 Mains, I tried them on the 230, 240 & 250 setting and they were silent and don't get hot .
All secondary's are centre tapped except for the single 0-12
On 240VAC setting I got the following from each secondary
35VAC 1 = 36.6-0-36.6 (73.5) +4.5% unloaded
35VAC 2 = 36.6-0-36.6 (73.5) +4.5% unloaded
42VAC 1 = 43.5-0-43.5 (87.3) +3.6% unloaded
42VAC 2 = 43.5-0-43.5 (87.3) +3.6% unloaded
12VAC = 12.8V
On 230VAC setting I got the following from each secondary
35VAC 1 = 38-0-38 (76.4) +8.6% unloaded
35VAC 2 = 38-0-38 (76.4) +8.6% unloaded
42VAC 1 = 45.3-0-45.3 (90.9) +7.8% unloaded
42VAC 2 = 45.3-0-45.3 (90.9) +7.8% unloaded
12VAC = 13.3V
On 250VAC setting I got the following from each secondary
35VAC 1 = 35.2-0-35.2 (70.4) +0.5% unloaded
35VAC 2 = 35.2-0-35.2 (70.4) +0.5% unloaded
42VAC 1 = 41.7-0-41.7 (83.7) -0.7% unloaded
42VAC 2 = 41.7-0-41.7 (83.7) -0.7% unloaded
12VAC = 12.0V
So overall good readings the secondary's are very even and the regulation seems about right 4.5%
Ill try some loading tomorrow if I can find the right power resistors
My only comment is that the goss band is just slipped over the transformer and covered in red electricians tape ?
I asked for mine in clear tape and the ones I have had in the past the Goss band is under the final wraps of the clear tape .
I would also expect to see a sticker on there as well to show the secondary colour coding for future ref
Alan