if the r-core output is really 1A you should be fine for tubes with heaters that run at 300-350mA, else you need to join in parallel the two secondaries for heater that need 600+mA like 6n1p or 6n6p
Greetings All,
I've been "lurking" around this site after I stumbled upon the Lampizator site about 2 years ago. With Oliver's encouragement have decided to post...
I'm including a couple of pictures of my my first "get your feet wet" Tubeizator project. I bought this player (Magnavox CDB470 uses a TDA1541a chip) on ebay for $32.00. I know that's like putting a killer engine in an old beat up car, but the transformation was unbelieveable! So now that's prompted me to undertake Oliver's DAC project....and I'm slowly learning the nuances of Mac generated music. (very slowly)
I'm not a circuit guru (ie Salas, Oliver, etc.). I just like awesome music reproduction.
Thank you Oliver for continuing to share you're wonderful boards with me and answering the numerous (hundreds?) of emails.
That's exactly what I was thinking (running the 2 (9V, 1A) taps in parallel). Thanks for the second opinion on the subject.
One question though, would the volts be (approximately) doubled on the transformer 9V outputs if ran in parallel? Wouldn't this cause the transformer to heat up more?
I see below that this is how crobbins5421 did it though and it sounds like it works fine. Is there any extra heat from the transformer crobbins5421?
Thanks Oliver for the PM you sent!
Greg
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Heat isn't a problem.....
Please understand though...I believe that I have a faulty transformer, one that puts out WAY too much power. My measured B+ is about 290V after adding a 30k resistor.
Yes, a few others have reported the same thing. I have a a few Vishay resistors ranging from 1.21Kohms to 1.63Kohms to put inplace of the 1Kohm resistor if i need to. Hopefully this will bring down the voltage output enough. Also, the HV Shunt will bring it down a little more. Thanks for the feedback.
Greg
Just finishing my order noticed that QSpeed rectifiers are out of stock at Mouser, what's the alternative or maybe what do you prefer ? Schottkys, Stelths (ISLs in previous part list) MURs, MRSs, other HEXFREDS ?
Looking for r-cores I couldn't find HV ones at Selectronics site (I want to avoid getting chinese ones - Selectronic has ones made in India which have good reputation. My first choice,C-cores, are almost impossible to find.
Also, is it worth separating HV (anode) from LV (heater) voltages i.e. different transformer ? Some suggest that.
Looking for r-cores I couldn't find HV ones at Selectronics site (I want to avoid getting chinese ones - Selectronic has ones made in India which have good reputation. My first choice,C-cores, are almost impossible to find.
Also, is it worth separating HV (anode) from LV (heater) voltages i.e. different transformer ? Some suggest that.
Hi Savvas,
if the Stealth´s from the 1st BOM are available get this one. MUR´s are also ok.
Because of the reported problems with the R-cores i would prefer to order a C-Core
from AE-Europe. They make outstanding custom transformers! Send Kim regards from me 😉
If you order the part No. #30317, you get the same voltage taps as i have on my transformer.
Best,
Oliver
if the Stealth´s from the 1st BOM are available get this one. MUR´s are also ok.
Because of the reported problems with the R-cores i would prefer to order a C-Core
from AE-Europe. They make outstanding custom transformers! Send Kim regards from me 😉
If you order the part No. #30317, you get the same voltage taps as i have on my transformer.
Best,
Oliver
Oliver - just checking - that transformer has all the taps for TDA1541A and the Tubizator?
If so I will order that - and now I will have to pre-order the new Tubizator.😀
Regards
Alan
Hi Oliver,
Can you please give me the size of the transformer Length, width, and height? Also Can you please give me the "footprint" size of the transformer. The distance from one screw hole to the other (length) and the width between one hole to the other? Also, it looks like I would need 2 transformers for the balanced tubeizators. Is that correct? Thank you Oliver.
P.S. I e-mailed about the transformer, but Kimm said their winding department is closed until February 6th, just as a heads up for people interested in ordering one.
Can you please give me the size of the transformer Length, width, and height? Also Can you please give me the "footprint" size of the transformer. The distance from one screw hole to the other (length) and the width between one hole to the other? Also, it looks like I would need 2 transformers for the balanced tubeizators. Is that correct? Thank you Oliver.
P.S. I e-mailed about the transformer, but Kimm said their winding department is closed until February 6th, just as a heads up for people interested in ordering one.
About all sizes of the transformer please ask Kim for details, because my transformer is made on my special Double-C-Cores witch have other specifications.
In principal you need for the 2nd Tube-I-zator only the taps for the HV and the filaments. Ask Kim if it is cheeper to made a separate transformer
only with the needed additional taps or a complete 2nd one.
Best regards,
Oliver
Oliver,
As the Tube-I-Zator boards (and the transformer) will be a little time I may as well get two of the HV shunts and build them - so how do I pay for two of these boards?
Alan
As the Tube-I-Zator boards (and the transformer) will be a little time I may as well get two of the HV shunts and build them - so how do I pay for two of these boards?
Alan