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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: Re: Power supply Cap
PostPosted: 23 Mar 2018, 14:08 
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Joined: 09 Oct 2012, 19:43
Posts: 308
Location: Vancouver Canada
Is your 5v AC or DC. If it is 5vAC then you could rectify, filter and get the 6.3v you need for the heaters. 5vac x 1.414 = 7.07vdc. Use res to get down to 6.3vdc when loaded with heaters.


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 Post subject: Re: Power supply Cap
PostPosted: 23 Mar 2018, 17:06 
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Joined: 04 Jun 2008, 20:59
Posts: 3842
Location: Arizona, USA
Hi, I always use the rated voltage on tube heaters. I have not found it to cause any issues. If the circuit is particularly sensitive to noise I raise the heater circuit to a DC potential that is higher than the heater voltage and cathode voltage combined. Typically about 1/3 of the B+ applied to the tube. This will scavange any stray electrons that don't seem to understand they need to head for the anode.

Good listening
Bruce

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 Post subject: Re: Power supply Cap
PostPosted: 25 Mar 2018, 14:23 
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Joined: 13 Mar 2018, 06:32
Posts: 14
Does anyone know what this high frequency stuff in on the B+ line is. The scope is set to 2mv and the frequence is set to 2uf.


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 Post subject: Re: Power supply Cap
PostPosted: 25 Mar 2018, 14:48 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Got flourescent, CFL or LED bulbs in the house? You're seeing their drivers. My bench is full of the noise >_<

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-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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 Post subject: Re: Power supply Cap
PostPosted: 25 Mar 2018, 15:09 
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Joined: 13 Mar 2018, 06:32
Posts: 14
Well, I turned off every light in the house (I have floresents in the shop and some LED in the house) and my shop and the signal is still there.


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 Post subject: Re: Power supply Cap
PostPosted: 25 Mar 2018, 15:25 
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Joined: 13 Mar 2018, 06:32
Posts: 14
Ok, it's my Tektronix 2215 scope. Simply plugging the 2nd probe and the signal goes away. Sorry to bothered you.


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 Post subject: Re: Power supply Cap
PostPosted: 25 Mar 2018, 16:32 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Haha, as long as it's solved! :up:

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* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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