The preamp cards I have for my 1/2" A80VU are transformerless. The cards used for 1/4" playback have an input transformer. I think I may be hearing some rectified RF/EMI in the 1/2" machine. I'd like to try the preamp cards with the input transformer to see if it helps.
The input transformers are a 1:10 stepup. That is too much gain for the 1/2"heads. I'd like to find a 1:1 or a 1:2 transformer to try. Ideally I'd like to find a transformer in the same form factor.
Here are some of the vital statistics as measured with a Peak LCR meter. Any help in sourcing suitable transformers would be greatly appreciated.
Ratio 1:10
Pin Spacing = 2.54mm
Primary:
DCR= 526Ω
L= 27.13H
Impedance at 1K= 187.2k +j 1.169
The Secondary is centertapped. Measurements are the whole coil
DCR = 22.9Ω
L=313.6mH
Impedance at 1K = 2.10k + j 1.169k
The input transformers are a 1:10 stepup. That is too much gain for the 1/2"heads. I'd like to find a 1:1 or a 1:2 transformer to try. Ideally I'd like to find a transformer in the same form factor.
Here are some of the vital statistics as measured with a Peak LCR meter. Any help in sourcing suitable transformers would be greatly appreciated.
Ratio 1:10
Pin Spacing = 2.54mm
Primary:
DCR= 526Ω
L= 27.13H
Impedance at 1K= 187.2k +j 1.169
The Secondary is centertapped. Measurements are the whole coil
DCR = 22.9Ω
L=313.6mH
Impedance at 1K = 2.10k + j 1.169k