Tranformer for Chinese pre amp (6N11) ?

fastasulike · 2nd February 2010, 02:56 PM

I have what may seem quite a simple question. I have purchased a Chinese pre amp module from ebay. It uses 2 x 6N11 tubes and the ad said to use 110VAC supply (HT supply?), no current specification, so I assume mains voltage, as I have 240VAC in the UK, this is out of the question, which brings me around to asking what rating transformer should be used?
I have ordered a 60VA/110VAC toroidal transformer for the purpose, but it appears to have 130VAC unloaded, is this a major issue and what current draw is likely for these tubes? Info is sparse for this module, so I thought I'd ask some experienced valve users.

A 6VAC 30VA heater supply is recommended BTW, so a 2 x 6V 60VA traffo could be used to implement a small diy DAC as well.

TheGimp · 07:28 PM

I would not considerit a major issue since my line voltage typically runs 125-128V. 130VAC is not unusual in the USA any more.

I presume you have ordered a 240VAC to 110VAC(130VAC) and plan on running it to step the voltage down.

There are two ways you can run it, (1) in line as a step down to power the unit, (2) as a line bucking transformer.

Either way should be fine. Just be sure to connect your earth to the chassis as well.

It sounds like you are ordering a seperate filament transformer. Is this correct?

Please post a link to the module on ebay so I'm sure I understand.

fastasulike · 3rd February 2010, 05:47 PM

The ebay link is here....

Pre-amp Tube Amplifier 6N11 SRPP Kit for DIY New on eBay (end time 06-Feb-10 03:17:24 GMT)

The board looks like this, although mine was sold as being 110VAC supply.

ernsttt · 28th May 2010, 06:16 PM

how did that tube preamp work out? i am thinking of getting the same one,

fastasulike · 29th May 2010, 12:17 PM

To be honest, with the good weather, the project has taken a back seat to a whole bucket load of house diy jobs.

One day I'll finish a project.

2nd February 2010, 02:56 PM	#1
fastasulike diyAudio Member Join Date: Nov 2009	Tranformer for Chinese pre amp (6N11) ? I have what may seem quite a simple question. I have purchased a Chinese pre amp module from ebay. It uses 2 x 6N11 tubes and the ad said to use 110VAC supply (HT supply?), no current specification, so I assume mains voltage, as I have 240VAC in the UK, this is out of the question, which brings me around to asking what rating transformer should be used? I have ordered a 60VA/110VAC toroidal transformer for the purpose, but it appears to have 130VAC unloaded, is this a major issue and what current draw is likely for these tubes? Info is sparse for this module, so I thought I'd ask some experienced valve users. A 6VAC 30VA heater supply is recommended BTW, so a 2 x 6V 60VA traffo could be used to implement a small diy DAC as well.

2nd February 2010, 07:26 PM	#2
TheGimp diyAudio Member Join Date: Aug 2009 Location: Johnson City, TN	I would not considerit a major issue since my line voltage typically runs 125-128V. 130VAC is not unusual in the USA any more. I presume you have ordered a 240VAC to 110VAC(130VAC) and plan on running it to step the voltage down. There are two ways you can run it, (1) in line as a step down to power the unit, (2) as a line bucking transformer. Either way should be fine. Just be sure to connect your earth to the chassis as well. It sounds like you are ordering a seperate filament transformer. Is this correct? Please post a link to the module on ebay so I'm sure I understand. Last edited by TheGimp; 2nd February 2010 at 07:28 PM. Reason: add request for link.

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3rd February 2010, 05:47 PM	#3
fastasulike diyAudio Member Join Date: Nov 2009	The ebay link is here.... Pre-amp Tube Amplifier 6N11 SRPP Kit for DIY New on eBay (end time 06-Feb-10 03:17:24 GMT) The board looks like this, although mine was sold as being 110VAC supply.

28th May 2010, 06:16 PM	#4
ernsttt diyAudio Member Join Date: Jul 2009	how did that tube preamp work out? i am thinking of getting the same one,

29th May 2010, 12:17 PM	#5
fastasulike diyAudio Member Join Date: Nov 2009	To be honest, with the good weather, the project has taken a back seat to a whole bucket load of house diy jobs. One day I'll finish a project.

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