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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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29th Sep 2019, 3:28 pm | #1 |
Triode
Join Date: Mar 2019
Location: Inverness, Scotland, UK.
Posts: 25
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Effect of removing valve from circuit?
I am converting a Bell & Howell 642 projector amplifier for guitar use.
Circuit diagram is attached. Part of the circuit is an oscillator used to power the projector's exciter lamp - I plan to remove V7 and associated components to keep things neater (and cooler) V7 has it's own heater supply so no problem from that perspective, but could removing this valve have any adverse affect on the rest of the circuit? I have compared voltages with those on the circuit diagram (for the 644 model) and they are fine as is the bias on V5 and V6 (well V5 is slightly "hot" but replacing the old bias resistors and caps should take care of that) I'm sorry if it's too basic a question, but I'm going round in circles with this! |
29th Sep 2019, 3:58 pm | #2 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,947
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Re: Effect of removing valve from circuit?
I can't see any potential problems.
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29th Sep 2019, 4:46 pm | #3 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Effect of removing valve from circuit?
The only effect it may have is a slight increase in HT voltage from the lower load on the supply. Very doubtful that this would be a problem as such.
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29th Sep 2019, 4:49 pm | #4 |
Triode
Join Date: Mar 2019
Location: Inverness, Scotland, UK.
Posts: 25
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Re: Effect of removing valve from circuit?
Thank you for the reassurance!
It sounds fantastic by the way! |