I have a 5k:8 ohm SE output transformer rated 5 watts. According to WE data sheet for 300b I can get 6.2 watts @350volts, 50 ma. Clearly will not be using at maximum output all the time. Will occasionally surpassing the rated 5 watts do any lasting harm? Or am I going to melt a winding😱
It's not a difference to worry about.
It will saturate more at lower frequencies.
More important is the dc current rating.
Do you have more specs?
Size, weight, primary inductance.
This will tell you more about what you can expect.
It will saturate more at lower frequencies.
More important is the dc current rating.
Do you have more specs?
Size, weight, primary inductance.
This will tell you more about what you can expect.
Yes, being Class A the most critical parameter is idle DC current it can handle.
Gap, magnetic flux saturation, available inductance, distortion, LF extencion, etc. all depend on that.
Compared to that, actuall Audio Power which is AC is not that important.
Gap, magnetic flux saturation, available inductance, distortion, LF extencion, etc. all depend on that.
Compared to that, actuall Audio Power which is AC is not that important.
More details
It is a Transcendar TT-005-OT, 0.8kg, 65ma, 20H inductance @ 120Hz, frequency response of 20 Hz to 80KHz +/- 1dB @ 1 watt. Too bad you can't get these any more, although the website is still there without any prices or ordering info😕
It is a Transcendar TT-005-OT, 0.8kg, 65ma, 20H inductance @ 120Hz, frequency response of 20 Hz to 80KHz +/- 1dB @ 1 watt. Too bad you can't get these any more, although the website is still there without any prices or ordering info😕
6 watts at 1KHz is not the same as 6 watts at 30Hz. What is first noticed with too small transformers is the <100Hz distortion. A wider airgap does not make up for a short of iron.
No free lunch?
It would seem that what people are telling me is that I should not expect very good bass performance from this transformer at relatively high output power🙁 Perhaps might work well with a 45 or 71a?😎
It would seem that what people are telling me is that I should not expect very good bass performance from this transformer at relatively high output power🙁 Perhaps might work well with a 45 or 71a?😎
The specs are incomplete. The power rating is only meaningful in the context of what frequency it is measured at. Power handling (saturation) is proportional to voltage squared, so if it handles 5 watts at 50Hz, it can handle 6.2 watts at 56Hz - no big deal. Does it handle 5 watts at 50Hz?
Measurements of
Output Transformers Transformers for 300B Single End amplifiers
Unofficial measurements performed at ETF2009
by Jean‐Michel Le Cléac’h
aside the shoot‐out of OPTs for SE 300B amplifiers amplifiers
http://www.tubesoundelectronics.de/tabellen/messtabelle_ot_etf2009.pdf
Output Transformers Transformers for 300B Single End amplifiers
Unofficial measurements performed at ETF2009
by Jean‐Michel Le Cléac’h
aside the shoot‐out of OPTs for SE 300B amplifiers amplifiers
http://www.tubesoundelectronics.de/tabellen/messtabelle_ot_etf2009.pdf
Well, IF those specs are measured @ 65mA and you will use only 50mA, 25% extra Audio power is no big deal, it will work fine.