PARTRIDGE TH1499
The TF1499 is really not an original Hiwatt DR201 type, but has the same wiring schematic as the TH7239 used for the DR201 with four KT88

Both amplifiers, the Sound City 200 and the Hiwatt DR 201, are well know for their outstanding bass respond, even at large volumes.

Their greatest disadvantages were their weights. The power transformer together with the output transfromer of both models were weighing over 12 kg.

Above I would like to give you some results of measurements of this transformer. Please keep in mind, that these measurements are time-intensively.

I don´t mind using these results on other sites, but I think it would be more than fair to ask before copy and paiste, thank you very much.

PARTRIDGE TH1499
Raa
2000 Ohms
Inductance@50Hz

self-inductance@7H
10 Volts@120H
230 Volts@325H
Leakage Inductance @1,6kHz
P1+P2/S 4,8mH
P1/P2 3,2mH
Frequency-Respond
DC-resistance (primary)
(Primary 1) 16,2 Ohms
(Primary 2) 18,9 Ohms
DC-resistance (secondary)
4 Ohms@0,15 Ohm
8 Ohms@0,24 Ohm
16 Ohms@0,33 Ohm
100 Volts@1,53 Ohm
self capacity of primary, CT and one side of secondary connected to core
ca. 600 pF
Frequency-Respond
With a -1dB frequency respond at 5 Hz this transformer has at even very low volumes an outstanding bass respond. High frequency respond is more absorded than at both other Partridge transformers.
Square Waves/Phase Shift Pictures
(resitive primary load 2*940 Ohm)
enlarge
100Hz/8Ohm (3,6 mW)
1kHz/8Ohm (3,6 mW)
10kHz/8Ohm (3,6 mW)
Phase Shift 20Hz/8Ohm (3,6 mW)
Settings
Phase Shift 10kHz/8Ohm (3,6 mW)
All square-waves and phase-shift pictures were taken at an output voltage of 3,6mW.
The lower beam is the original signal, the upper is showing the output signal, taken from the 8 Ohms tap.