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wrenchone 31st October 2007 04:13 AM

Appropriate Iron for 211 Triode SE
I'm thinking of doing a 211 SE amp sometime down the way, and would like recommendations on some good iron that won't break the bank. Plate voltage reccomendations wouldn't hurt, either. I was thinking of about 900V.

tube-lover 31st October 2007 05:09 AM

will U care I share my experience.


wrenchone 31st October 2007 05:30 AM

Well, go ahead...

Tweeker 31st October 2007 08:13 AM

1000VCT 6.3V 400VA Toroidal Power Tube Amp Transformer
, with a 10H+ 300ma+ (if stereo) choke input should give a supply in the range your looking for with SS or hybrid bridge rectification.

A few 80 MFD 500 VAC 50/60 hz Eyuda International Oil Filled Motor Run Capacitors for B+.

A separate, likely DC, filament supply will be needed.

Budget OPTs for amps of this sort are another can of worms entirely.

kevinkr 31st October 2007 04:03 PM

Probably no such thing as a budget opt for this project, but talk to Jack Elliano over at Electra-Print about it. His prices are extremely reasonable compared to most of the crowd, and his transformers work very well. (I'm a satisfied customer, the custom ones he made for my 500mW headphone amplifier are very, very, good indeed.)

Heyboer might be another possibility.

In this case parafeed might be another option to consider as it would simplify the HV power supply filtering requirements. Removing the dc from the core in high impedance applications usually results in a transformer with better overall performance at the frequency extremes.

soulmerchant 31st October 2007 08:15 PM

It will be BIG and HEAVY. They don't call amps like this boat anchors for nothing... Not really worth doing on the cheap.

There are some 10k SE chinese opt's on fleabay that are really cheap. No idea if they even have an air gap...

wrenchone 1st November 2007 06:04 AM

Whai I was after was concrete suggestions on primary impedance , idle current and plate voltage from people who've been there, as well as suggestions for output transformer sources. The power supply will be a switching converter of my own design and construction, so no worries there..

tube-lover 1st November 2007 07:54 PM


I had this tube amp in my side & recently I broken for it & need to know why its so expensive & after i use over two months I feel it was quite good with Horn speakers. sound was detail & very fast. dynamic.

this is AN Kondo Ongaku push TAD horn speakers.

I also was OEM some OPT for Japan audio company. production some Superadio metal OPT & nano amorphous. I had a question that can I made same level OPT or probably better than it. than I Broken for it & test all seperate data. clone for it & comapre for original performance.

I will one by one post in here for this several month plan.



tube-lover 1st November 2007 07:56 PM

Istep by step open for the tube amp & test data.



Tubelab_com 2nd November 2007 02:08 AM


Whai I was after was concrete suggestions on primary impedance , idle current and plate voltage from people who've been there,
I built an amp that used either 211's or 845's. It uses 10 K OPT's and operates at 1050 volts. I set the current at around 70 mA when using NOS tubes, but I have cranked the Chinese ones up to 100 to 110mA. They just sound better. The OPT's that I have are no longer available.

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