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Old 10th Sep 2011, 9:55 pm   #1
maninashed
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Join Date: May 2011
Location: Preston, Lancashire UK
Posts: 955
Default Linear Conchord/RSC A11 30 watt amp

Hi everyone, the Linear Conchord 30 watt amplifier was very common in the 60s/early 70s and was sold ready made or in kit form by RSC Hifi centres all round the country and was very popular. The ready built versions used the
EL34 output pentode but the kit form used the 807 tetrode valve which at the time was plentiful in the surplus market. Its original use was as a transmitter PA valve I believe. My question is, does anyone have a copy of the original circuit diagram of the RSC/ Linear amp using the 807? It used a different biasing arrangement to the EL34 versioin. Im not interested in the PW version as I think its inferior. My intention is to build a stereo valve amp of approx 40w per channel using the 807, with some circuit modification to improve performance. Any advice or assistance would be welcome.
Bill
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