single stage amp?

Chestnutt · 23rd November 2011, 09:37 PM

Is it possible to build a single stage amp that has a transformer on the input?
Could the a concentional source drive such an amp?

Vinylsavor · 23rd November 2011, 10:02 PM

The usage of an input transformer has nothing to do with the number of stages, so yes it can be done. Can a conventional source drive it. IME not so well. Depends on the transformer (step up ratio) miller cap of the tube and the output impedance and type of output stage of your source

MrCurwen · 23rd November 2011, 11:37 PM

Depends a lot on what kind of tube you intend to use.

A 6C45P will do nicely, with no input transformer.

Leonid · 24th November 2011, 08:15 AM

Îäíîëàìïîâûé óñèëèòåëü íà 6Ï9

But, R3 - 500 Ohm

Vinylsavor · 24th November 2011, 09:11 AM

Hi!

The 6HS5 works nicely in a single stage amp too:

VinylSavor: Tube of the Month: The 6HS5

7-8W SE. Needs about 2.75V RMS at it's input for full power out. This could be reduced to more common 0.75-1V with a step up input transformer. But since many sources and preamps have way too much gain, an input transformer would not be needed in most cases.

Thomas

MrCurwen · 24th November 2011, 12:24 PM

The 6HS5 seems super interesting! For me especially for ESL direct drive applications. It's just too bad I'm already addicted to the directly heated sound.

If you use parafeed, your options open up a bit more, as some of these medium mu small transmitter triodes have a high Rp, and would be impractical with an OT. Plus they've got that DHT magic if that's up your alley.

23rd November 2011, 09:37 PM	#1
Chestnutt diyAudio Member Join Date: Sep 2011	single stage amp? Is it possible to build a single stage amp that has a transformer on the input? Could the a concentional source drive such an amp?

23rd November 2011, 10:02 PM	#2
Vinylsavor diyAudio Member Join Date: Feb 2002 Location: Lindau	The usage of an input transformer has nothing to do with the number of stages, so yes it can be done. Can a conventional source drive it. IME not so well. Depends on the transformer (step up ratio) miller cap of the tube and the output impedance and type of output stage of your source __________________ http://vinylsavor.blogspot.com/

24th November 2011, 09:11 AM	#5
Vinylsavor diyAudio Member Join Date: Feb 2002 Location: Lindau	Hi! The 6HS5 works nicely in a single stage amp too: VinylSavor: Tube of the Month: The 6HS5 7-8W SE. Needs about 2.75V RMS at it's input for full power out. This could be reduced to more common 0.75-1V with a step up input transformer. But since many sources and preamps have way too much gain, an input transformer would not be needed in most cases. Thomas __________________ http://vinylsavor.blogspot.com/

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23rd November 2011, 11:37 PM	#3
MrCurwen diyAudio Member Join Date: Feb 2010	Depends a lot on what kind of tube you intend to use. A 6C45P will do nicely, with no input transformer.

24th November 2011, 08:15 AM	#4
Leonid diyAudio Member Join Date: Aug 2010 Location: Novokuznetsk	Îäíîëàìïîâûé óñèëèòåëü íà 6Ï9 But, R3 - 500 Ohm

24th November 2011, 12:24 PM	#6
MrCurwen diyAudio Member Join Date: Feb 2010	The 6HS5 seems super interesting! For me especially for ESL direct drive applications. It's just too bad I'm already addicted to the directly heated sound. If you use parafeed, your options open up a bit more, as some of these medium mu small transmitter triodes have a high Rp, and would be impractical with an OT. Plus they've got that DHT magic if that's up your alley.

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