Huge OPT and small tubes

Hojvaelde · 11th May 2006, 09:13 AM

Hello

Just a simple question.

One of my frends was on a local jumble sale and found a box of old trafoes, some tubes, caps and resistors and so on. Why not me!

OK.

I found in the box 5 psc 6L6 tubes and 2 used Hammond 1650R (painted green

). He asked me to build a amplifier out of the parts. 2 pcs 6L5 i pp.
But the trafoes is verry big, > 300 mA and the tubes is small < 100 mA. Is that a problem.

Regards

Benny

tubelab.com · 11th May 2006, 12:47 PM

1650R is not a bad match for P-P 6L6. It is a 100 watt transformer. A pair of 6L6 can do 40 to 60 watts depending on how hard you push them. The large transformer will allow some headroom and remove the possibility of saturation on strong bass notes. The extra iron will cost you a little bit of power (a watt or two) and may mask some fine musical detail due to the larger hysteresis in the larger iron.

If you build an amp with these transformers, and you have a large enough power transformer, you could upgrade to KT-88 later for more power.

Hojvaelde · 11th May 2006, 01:14 PM

Thanks.

I will se what power trafoes he have in the box. I thonk there is 2 pcs. A huge and medium type. I think the manufactur is Hammond, used and both painted green.

Yak color on a trafo.

Benny

arnoldc · 11th May 2006, 11:27 PM

The smaller one could be a choke, so you're on a roll.

11th May 2006, 09:13 AM	#1
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Huge OPT and small tubes Hello Just a simple question. One of my frends was on a local jumble sale and found a box of old trafoes, some tubes, caps and resistors and so on. Why not me! OK. I found in the box 5 psc 6L6 tubes and 2 used Hammond 1650R (painted green ). He asked me to build a amplifier out of the parts. 2 pcs 6L5 i pp. But the trafoes is verry big, > 300 mA and the tubes is small < 100 mA. Is that a problem. Regards Benny

11th May 2006, 12:47 PM	#2
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	1650R is not a bad match for P-P 6L6. It is a 100 watt transformer. A pair of 6L6 can do 40 to 60 watts depending on how hard you push them. The large transformer will allow some headroom and remove the possibility of saturation on strong bass notes. The extra iron will cost you a little bit of power (a watt or two) and may mask some fine musical detail due to the larger hysteresis in the larger iron. If you build an amp with these transformers, and you have a large enough power transformer, you could upgrade to KT-88 later for more power. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

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11th May 2006, 01:14 PM	#3
Hojvaelde diyAudio Member Join Date: Jan 2005 Location: Denmark	Thanks. I will se what power trafoes he have in the box. I thonk there is 2 pcs. A huge and medium type. I think the manufactur is Hammond, used and both painted green. Yak color on a trafo. Benny

11th May 2006, 11:27 PM	#4
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	The smaller one could be a choke, so you're on a roll.

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