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Commonly Seen EIA Codes
http://www.triodeel.com/eiacode.htm#:~:text=They%20generally%20follow%20the%20following%20format%3A%20%28example%29%20322,the%20year%20%281959%29%2C%20and%2004%20is%20the%20week.
Audio Transformers
https://www.jensen-transformers.com/wp-content/uploads/2014/08/Audio-Transformers-Chapter.pdf
LL = 2ðfL, where X is inductive reactance in ohms, f is frequency in Hz, and L is inductancein Henries. An induct orgenerally consists of many turns or loops of wire called a coil, as shown in Figure 3, which links and concentrates magnetic flux lines, increasing the flux density.
Output Transformer Impedance
http://www.radioremembered.org/outimp.htm
The function of the audio output transformer is to transform the high impedance of the output tube to match the much lower impedance of the speaker. This is necessary to get an efficient transfer of the audio signal to the speaker. The output transformer as an impedance matching device, works on the principal of reflected load.
Commonly Seen EIA Codes
http://www.triodeel.com/eiacode.htm
Transformers & Coils: EIA code: Stancor (Chicago-Standard) 138: Coil Engineering: 141: Ensign Coil: 172: Freed : 183: General Radio: 194: Jefferson Electric: 218: Thordarsen-Meissner: 238: Merit Coil & Transformer: 239: Standard Coil: 305: Essex (Transformer Division) 352: New York Transformer: 366: Altec Lansing-Peerless: 391: Foster Transformer: 394: General …
Transformer and Wire Color Standards for Tube amps
http://www.regiscoyne.com/tech/trannyCC/
Plate lead (pri.)-------------- blue (start) B+ (power supply) lead--------- red (center tap) Plate lead (pri.)-------------- brown (finish) speaker (typ. +) (sec.)-------- green (or yellow) speaker return (sec.)---------- black. Ordinarily the black side should also be grounded, if the speaker isgrounded.
Understanding Your Output Transformer Part One by Mark ...
https://victoriaamp.com/understanding-your-output-transformer-part-one-by-mark-baier/
In an output transformer, the low frequency response is largely governed by the size or mass of the stack. The bigger the stack, the lower it will go without saturating. (That’s why an SVT weighs so much, its OT is the size of a Oldsmobile!). What Leo did, his genius, was to deliberately inhibit the low frequency response of the amplifier by ...
Valve Amps: Output transformers - Lenard Audio
https://education.lenardaudio.com/en/14_valve_amps_5.html
B+ is the supply Voltage to the CT Center Tap of the primary windings of the output tranny. 560V DC supply is connected to the CT Center Tap of the Primary winding. The amplified audio from the 2 output valves, push pull is in opposite phase 180deg. 300VAC + 300VAC = 600V AC is across the primary winding.
Audio Transformer - Engineers Garage
https://www.engineersgarage.com/audio-transformer/
Line Output. Typically, audio transformer is driven by an amplifier and loaded by several thousand pF cable capacitance and high input impedance of line receiver. Therefore, a line output transformer should have low output impedance which remains low at high frequencies. This requires both low resistance windings and very low leakage inductance. 5.
Audio Transformers - Hammond Mfg.
https://www.hammfg.com/electronics/transformers/audio
Classic Tube Output Audio Transformer Overview. Universal Single Ended Tube Output. Audio. 125SE Series. Universal Push-Pull Tube Output. Audio. 125A-125E Series. Tube Output (25 - 75 Watts) Single Ended - HI-FI. 1627-1642 Series. General Replacement Tube Output (8 Watt) Push-Pull. 125H Series. General Replacement Tube Output (8 Watt) Push-Pull. Audio. 125J Series
Audio transformers • Tube output transformers • Lundahl ...
https://www.lundahltransformers.com/tube-output/
If you need to more easily switch between different speaker impedances on our output transformers LL1620, LL1623 and LL1627, this sheet suggests two different wiring alternatives where the OPT secondary is reconnected using only three jumpers. The LL1620CFB_8 and LL1620CFB_25 are special version of the LL1620 where the primary windings have been split …
Output Transformers | Audio Note (UK)
https://www.audionote.co.uk/output-transformers
The Output Transformer is, without doubt, the single most important component in any high quality valve amplifier. It is impossible to make a truly exceptional amplifier without investing in the best possible Output Transformer, which in turn must be correctly designed for the circuit and valves being used. Many theoretically decent amplifiers ...
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