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It is currently 22 Jun 2018, 04:24

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 Post subject: Re: KT120 Oddblocks
PostPosted: 19 May 2018, 17:36 
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Joined: 04 Jun 2008, 20:59
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Location: Arizona, USA
Hi, 1 watt is fine, really even a 1/2 watt is good enough. I prefer "flame proof" ones but a standard one is OK.


Good listening
Bruce

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 Post subject: Re: KT120 Oddblocks
PostPosted: 21 May 2018, 02:43 
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Joined: 07 Mar 2017, 03:14
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Thanks.


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 Post subject: Re: KT120 Oddblocks
PostPosted: 20 Jun 2018, 02:50 
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Joined: 07 Mar 2017, 03:14
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Hi Bruce,
If I don't remember wrong, you mentioned that you separately made ground connections of power output stages to central ground bus (preferably on the input jack). What are the grounds of output stages exactly?
KT-120 tube cathode grounds (on the outputs of LM317HVs )? B+ filter cap (10uF) ground? Output transformer secondary ground?

If you can show them on the KT120 schematic I'll appreciate it.


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 Post subject: Re: KT120 Oddblocks
PostPosted: 21 Jun 2018, 16:18 
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Hi, I return all signal grounds to a "buss" at the input jacks. Essentially a large gauge wire between the ground lugs of all the inputs. (remember the chassis is not directly connected to this but goes to it via a type X2 capacitor and parallel resistor) I run separate ground wires from the LM317s to the buss. Other independent connections are from the the other circuityr stuff (power supply grounds and active circuit grounds). The idea is to make sure that large amounts of power are not flowing through the same conductor wires as signal grounds are. It is impossible to completely do this but the fewer sources of noise (power in the grounds) the better. When everything comes together at the inputs it seems to make for the lowest noise level and fewest chances for ground loops in the amps. A "star" ground at the input is essentially the same. I just find it more conveneient to use something like 12g copper wire to go between the things that need to ground there. A true "buss bar" would likely be even better.

Good listening
Bruce

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