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Old 29th March 2013, 01:34 PM   #681
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Hammond 166 and 266 series are a good solution, with dual (split) bobbin across the range.

Hammond Mfg. - Power Transformer - Dual Primary / Dual Secondary (266 Series)

Or use the 166 for 115V-only and lower cost.
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Old 29th March 2013, 02:49 PM   #682
Abszero is online now Abszero  United States
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Regal,
I use a couple of Rod's regulators each feeding 4x 4p1l ( parallel push pull) filaments at 4.2 V total 1.3A. Each channel has its own raw supply and regulator. I know that 4p1l acts more linear at 2.1V filament, i tried but didnt like the sound. For the raw supply i bought some propower( made in England dual metric bobbins) transformers from Newark. The 75W was only $25. For the push pull i am working on now there is no issue to have a separate chassis for power supply. My next project will be a quad 4p1l PSE with filament bias. I bought two more regulators from Rod and intent to use them at 2.1V and 4x0.55-.6A(2.2-2.4A). It is going to be more challenging, bigger iron, more amps ripple for the filtering capacitors, bigger heatsink...hope for a better sound too...
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Old 29th March 2013, 03:11 PM   #683
regal is offline regal  United States
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Thing I am concerned about is heatsinking, the two SSHV's are going to take up most of the back of the amp for a heatsink, so I'm going to have to find a wide case to sink two SSHV's + two coleman regs, it will be worth it though
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Old 30th March 2013, 02:55 AM   #684
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Quote:
Originally Posted by regal View Post
Thing I am concerned about is heatsinking, the two SSHV's are going to take up most of the back of the amp for a heatsink, so I'm going to have to find a wide case to sink two SSHV's + two coleman regs, it will be worth it though
Did you see these chassis?
new chassis source

You get to pick the size you want, up to 24" wide.
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Old 30th March 2013, 03:31 PM   #685
tame is offline tame  Israel
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Abszero.
Can you post the schematic of your 4x 4p1l parallel push pull amp, please?
What output transformers you use?
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Old 30th March 2013, 04:15 PM   #686
Abszero is online now Abszero  United States
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Quote:
Originally Posted by tame View Post
Abszero.
Can you post the schematic of your 4x 4p1l parallel push pull amp, please?
What output transformers you use?
I don't have the schematics ready, but I can describe it for you.
Paralleled 4P1l triode mode at 240V and 35mA ( 93% PDmax) push pull, filament bias, OT is LL1663. Filaments of 4P1L at 4.2V with Rod Coleman's regulators. IT is LL1660/10mA, driver 6N30P at 25mA and 90V cathode bias. Power supply with LL1649, LL1638 choke, clarity caps, and SSHV for driver. Raw supply for Rod's regulators uses SPC ProPower 75W, 2x9V,4A. No global NFB.
The amp needs 2V from CD player for full power. I have it built and under testing now. Sounds sweet and transparent. I am listening it with Klipsch Sinergy B3. Excellent playing classical, jazz, voice. I intent to have it for sale by this summer at simplepleasuretubeamp.com.
Best,
Radu
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Old 30th March 2013, 05:03 PM   #687
tame is offline tame  Israel
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How much Rod Coleman's regulators you use in this amp?
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Old 30th March 2013, 05:13 PM   #688
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Quote:
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How much Rod Coleman's regulators you use in this amp?
The Filament Regulators are DIY kits for self-assembly. I can send you some email/PM with details, manuals and cost.
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Old 30th March 2013, 05:57 PM   #689
Abszero is online now Abszero  United States
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I used a pair. One for each channel. I bought the kits from Rod and very happy.
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Old 23rd April 2013, 03:48 PM   #690
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Default opt

I'm looking at the Sowter TRANSFORMERS FOR HEADPHONE AMPLIFIERS to get the appropiate opt for the attached schematic? also I need to know the appropiate power spec for B+ 300V for 4p1l & 440V for 307A (I want to use SSHV2 so I need extra 20V for the reg)?

TIA
Felipe
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