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 Post subject: Re: Single ended amplifier
PostPosted: Oct Wed 11, 2017 7:22 pm 
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Unless you are using a very efficient speaker 2 watts at 8% distortion which may actually be around 1.5 watts undistorted will not be nearly enough.

Suggest using a higher B+ voltage such as 250-300 volts and re-bias accordingly.

Look at any schematic of a radio using the 6V6 tube single ended and duplicate the parts values and how it is connected along with the B+ voltage.

If you can draw up a schematic of the amp as it currently is connected and post it here I can further help determine what components should be used and what B+ needs to be.

Now if you want a higher B+ voltage using the same transformer then ditch the 6X5 and use a couple diodes in its place which will give an unloaded B+ of 254.52 Vdc.

That should be enough to get you around 4.5 watts of audio.


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 Post subject: Re: Single ended amplifier
PostPosted: Oct Wed 11, 2017 9:43 pm 
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Location: Haledon, NJ, usa
Tube Radio wrote:
Unless you are using a very efficient speaker 2 watts at 8% distortion which may actually be around 1.5 watts undistorted will not be nearly enough.

Suggest using a higher B+ voltage such as 250-300 volts and re-bias accordingly.

Look at any schematic of a radio using the 6V6 tube single ended and duplicate the parts values and how it is connected along with the B+ voltage.

If you can draw up a schematic of the amp as it currently is connected and post it here I can further help determine what components should be used and what B+ needs to be.

Now if you want a higher B+ voltage using the same transformer then ditch the 6X5 and use a couple diodes in its place which will give an unloaded B+ of 254.52 Vdc.

That should be enough to get you around 4.5 watts of audio.

I'm not sure that the 180v B+ isn't enough Tuberadio.
I say that based on the performance I get from my (6v6-like) 5902 PP amp where I'm only using 140v B+.
It's quite loud enough to fill the house.
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 Post subject: Re: Single ended amplifier
PostPosted: Oct Wed 11, 2017 10:05 pm 
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Here's an Airline radio 35wg-1573B using the 6V6 at 185v on the plate .... and a 6X5 rectifier
It uses a 300 ohm cathode bias resistor at 8.8v bias

Attachment:
airline 35wg-1573b.pdf [135.38 KiB]
Downloaded 15 times

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 Post subject: Re: Single ended amplifier
PostPosted: Oct Thu 12, 2017 12:05 am 
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Yours is push pull though.


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 Post subject: Re: Single ended amplifier
PostPosted: Oct Thu 12, 2017 12:42 am 
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Tube Radio wrote:
Yours is push pull though.

Yes... but the Arline 35wg-1573B ... is not.
And it has 185v on the plate and they use a 6X5
Cathode resistor 300 ohms 8.8v bias

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