Hi, I just salvaged a single ended 6L6 amp from a 1960 reel to reel. The OT is a Schumacher but it has three wires on the secondary side yellow, green, black. The black wire was going to cathode of the 6L6. I've never seen three wires on the secondary side of a single ended OT - anyone know what that's about?
Thought I'd build a 6L6 Champ.
Single ended 6L6 output transformer
Moderators: pompeiisneaks, Colossal
Re: Single ended 6L6 output transformer
Do you mean the primary side?
Could it be an ultra linear tap?
Could it be an ultra linear tap?
Re: Single ended 6L6 output transformer
Secondary. Color scheme is fairly normal, blue / brown on the primary and green / black/ yellow on the secondary.
Is there ever any reason to use a center tap on a secondary?
Is there ever any reason to use a center tap on a secondary?
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Stevem
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Re: Single ended 6L6 output transformer
Yup, you can drive the OT like a cathode follower.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: Single ended 6L6 output transformer
(deleted)
Last edited by matt h on Fri Mar 27, 2015 3:30 am, edited 1 time in total.
Re: Single ended 6L6 output transformer
Yes, without a schematic, it's hard to day what it going on. But, it sounds like the secondary is not "centered tapped" but has a common, 4 ohm, 8 ohm taps. You could verify that by measuring the turns ratio.
What?
Re: Single ended 6L6 output transformer
This may be it because the OT seems to be the only way that the cathode was grounded.matt h wrote: you can ground the cathode THROUGH the secondary of the OT as a means of providing some local NFB as well.
Without having a full description of the circuit (or schematic) it's hard to say exactly what's going on.
Measuring the secondaries I get about 1 ohm yellow to green, 16 ohms yellow to black and 17 ohms green to black.
Primary side is about 285 ohms.
The circuit was a real mess as it was integrated into the reel to reel. I just saw "single ended 6L6" and started to grab the parts that I wanted and then realized the 3 wire secondary thing.
Looks like I can just ignore the black wire and use this as a regular SE OT.
Re: Single ended 6L6 output transformer
Number three.
Sorry Steveneddy, you already had your turn in the chair.
What?
Re: Single ended 6L6 output transformer
Is that Madam, Ma'am or MistressJana wrote:
Number three.
Sorry Steveneddy, you already had your turn in the chair.
TM
