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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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#21 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 5,565
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It is negative current feedback, taken from the cathode resistor and fed back to the input. So no it won't correct any non-linearities in the O/P transformer. Also, the damping on the loudspeaker will be nearly non-existent.
There are tone controls, but they are within the feedback loop which consequently will try to nullify them! An interesting circuit, but not what I'd call a 'good' circuit. |
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#22 |
Hexode
Join Date: Jan 2013
Location: Wigan, Lancashire, UK.
Posts: 363
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Back to UY85 - UL84 amplifiers - If for safety, an isolation transformer was fitted to one of these record players from which the BSR motor was also supplied, what current/VA rating would the isolation transformer need to be?
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#23 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 14,995
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The motors don't take much power though they may need rather more VA.
Heaters are about 9W, HT maybe 12W or so, allow 25VA for the motor and a 50VA transformer should do the biz. Go for 100VA if you want it all to stay nice and cool.
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#24 |
Hexode
Join Date: Jan 2013
Location: Wigan, Lancashire, UK.
Posts: 363
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Ok thanks.
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#25 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,176
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One post about the Radio Constructor articles moved to the Websites section for information.
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Bill, BVWS member |
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