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Инструкция LUNDAHL LL9202 — страница 3

Инструкция ФорматPDF Размер0,05 МБ Страниц4 КатегорияИнструменты / Контрольно-измерительные приборы ДобавилMiraUser49

Инструкция для LUNDAHL LL9202 на русском языке. Документ можно использовать для ознакомления с информацией, относящейся к данной модели.

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LL1620, LL1623, LL1627, LL9202
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Electrical characteristics
Primary Load Impedance, Primary DC Current Core Air-gap and Maximum Output Power
Secondary connection for 4/8/16 Ω
(See next page)
Core Airgap (Delta/2)
-/B/C B/C/D C/D/E 25 µ
(Push-Pull)
125 µ
(Single Ended)
190 µ
(Single Ended)
250 µ
(Single Ended)
Primary Load Impedance
(transformer copper resistance included)
DC current for 0.9 Tesla (rec. operating point)
Primary Inductance
LL1627
2.3 kΩ 1.2 kΩ 0.65 kΩ
Push-Pull
60 H
90 mA
18 H
140 mA
12 H
185 mA
9 H
LL1623
5.6 kΩ 3.0 kΩ 1.6 kΩ
Push-Pull
150 H
60 mA
46 H
90 mA
30 H
120 mA
23 H
LL1620
11.5 kΩ 6.0 kΩ 3.3 kΩ
Push-Pull
300 H
40 mA
90 H
60 mA
60 H
80 mA
45 H
LL9202
23 kΩ 11 kΩ 6.5 kΩ
Push-Pull
570 H
50 mA / 225µ
100 H
85 mA / 400µ
57 H
Output Power and Loss
62W 125W 250W
Max. Power, Push-Pull at 30 Hz
All types
13W 25W 50W
Max. Power, Single Ended at 30 Hz
0.2 dB 0.5 dB 0.8 dB
Loss across transformer
Our recommendations on how to choose your tube output transformer:
Push-pull output stages:
All our push-pull output transformers have a 25 microns core air gap to allow for a small DC unbalance of your output
circuits.
Step 1 From your secondary load impedance (4, 8 or 16 ohms), we suggest a secondary connection alternative with 0.5
dB loss. This will give you a maximum power limit of 125W at 30 Hz, and a LF -1 dB point at 6.4 Hz for
pentodes and lower still for triodes.
If you require more headroom at low frequencies, the 0.8 dB loss alternative expands the LF limit one octave.
Step 2 Your tube choice gives you a desired primary load impedance. Select the transformer type having a primary load
impedance which best matches the desired impedance.
The LL1623 (5.6 kΩ plate-to-plate impedance) or the LL1620 (6.0 kΩ plate-to-plate impedance) suits many
tubes like the 300B triode or the EL34 pentode. The 6C33 (low voltage, high current) requires a transformer
LL1627 while high anode voltage tubes require the high impedance of the LL1620.
Footnote: In class A push-pull, each tube will see a load impedance = 1/2 transformer primary load impedance.
In class B push-pull, each tube will see 1/4.
Single-end output stages:
The core of Single End output transformers have an airgap. The purpose of the airgap is to accept the DC current of the
output tube without saturating the core, leaving enough headroom for the sound signal. As a result of the airgap, the primary
inductance is lower for SE output transformers compared to P-P dittos. In addition, the inductance tends to vary with DC
current. For our high quality C- cores with carefully ground surfaces, the variation is within +7% of rated value.
Step 1 We recommend that, given your secondary load impedance (4, 8 or 16 ohms), you select a secondary connection
alternative with 0.5 dB loss. This will give you a power limit of 25 W at 30 Hz. If you find that you require more
bass headroom, select a secondary connection alternative with 0.8 dB loss.
Step 2 From the tube load line you determine a primary load impedance. This results in a choice of transformer main
type.
Step 3 From the tube data sheet you also select your desired DC current. From the table above you select the transformer
subtype (DC current) which best fits your needs. For many tubes such as the 300B and the EL34, the transformer
LL1623 / 90 mA is the ideal choice.
Step 4 We define Power Low Frequency Limit, F
PL
, as the frequency where ωL
P
= R
LOAD
. (The reactive impedance of
the transformer equals the primary load impedance). At F
PL
, the output power is reduced to 50%. For the
LL1623 / 90 mA in a 0.5 dB loss connection, F
PL
= 16 Hz (R
PRIMARY
= 3.0 kohms and L
P
= 30H).
Step 5 We define Response Low Frequency Limit, F
RL
as the frequency where a (small) output signal is reduced with
-1 dB due to finite primary inductance. F
RL
= ω / π, if you solve ω in
ωL
P
= (R
LOAD
in parallell with R
ANODE
).
For the LL1623 / 90 mA and a 300B triode, F
RL
= 7 Hz. (R
ANODE
= 650 ohms, R
PRIMARY
= 3.0 kohms and L
P
=
30H),
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