Hewlett Packard HP Audio Oscillator Generator 200AB For Sale

Hewlett Packard HP Audio Oscillator Generator 200AB
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Hewlett Packard HP Audio Oscillator Generator 200AB:
$74.99

This unit is being sold as-is due to damaged cable wiring, preventing thorough testing of the oscillator. However, internal component pictures are included for reference. Despite this limitation, the unit is in good cosmetic condition and shows signs of careful previous use.
Unique Circuit Design:
  • The HP-200AB features a distinctive circuit design that includes a classic Wien bridge oscillator coupled with a separate push-pull audio amplifier. The amplifier is equipped with an output transformer with a 600-ohm output and a separate winding that provides inverse response, resulting in excellent relatively flat response from 20 Hz to 40 KHz. The amplitude control, which functions as a volume control, separates the oscillator circuit from the amplifier circuit, with a shield separating the two sections.
Low Distortion Amplification:
  • According to the HP-200AB manual, the output transformer contains a tertiary winding for overall negative response in the amplifier section, ensuring minimal distortion. The amplifier section utilizes a 6SN7 preamp and direct-coupled phase inverter, along with a pair of 6K6 tubes in push-pull configuration as the output tubes. Despite the specified output of one watt into 600 ohms, the circuit parameters allow for nearly 10 watts RMS output with a sufficient input level to the 6SN7.
Versatile Applications:
  • While originally designed as an audio generator, the HP-200AB also serves as a high-quality monobloc amplifier. Experimenters and enthusiasts alike will appreciate its versatility and potential for alternate uses. Simply hook up a speaker and 70-volt transformer, feed the 6SN7 with a relatively high-level audio signal, and experience the impressive performance of the HP-200AB as an audio amplifier.
Note: there's an abundance of old school manuals with detailed parts lists, schematics, and troubleshooting guidance for the 200AB, providing a higher degree of repairability for these will ship UPS Ground same-day if ordered before 1pm Central, but no later than 1 business day handling time (business days are M-F). This will be packed with exquisite care.
I will accept returns within 30 days, but please carefully review the notes and all pictures before buying!
Please also feel free to message me if you have any questions.
Thanks for looking!


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