Audio transformers • Tube output transformers • Lundahl Transformers.pdf

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11/27/2020

Audio transformers • Tube output transformers • Lundahl Transformers

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Tube ampli er output transformers

All OPTs are built in our dual coil single C-core style and

can be ordered with a choice of core air-gap for Push-Pull

or Single-Ended applications. Most of our OPTs can be

con gured for different primary and secondary

impedances.

The use of C-cores with well-de ned air-gap results in an

almost constant inductance throughout the whole

operating voltage range. For SE transformers, the primary

inductance variation due to signal level is less than 7%.

Most of the transformers below are available with

amorphous iron C-cores. The amorphous cores are

considered to have sonic advantages, but the signal level

capability with amorphous core is about 30% less than

with a conventional silicon-iron C-core.

Tube output

Search:

Primary

impedance

600

650

680



Secondary

impedance

4Ω

8Ω

16 Ω



Max power capability at 30

Hz, Push-Pull

700W

250W

700W



Max power capability at 30

Hz, Single End

140W

50W

140W



Weight



4.5 kg

2.5 kg

4.6 kg

Transformer

type

LL1693

LL1627

LL2768



Con guration



Privacy

Terms

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Primary

impedance

1.2k

1.6k

2.3k

2.6k

2.7k

3.1k

3.2k

3.3k

Audio transformers • Tube output transformers • Lundahl Transformers



Secondary

impedance

4Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

5Ω

8Ω

16 Ω

4Ω



Max power capability at 30

Hz, Push-Pull

360W

125W

180W

360W

125W

180W

360W

125W

360W

250W

105W

62W

180W

62W

180W

188W

180W

125W

12W

55W

125W

12W

105W

100W

125W

250W



Max power capability at 30

Hz, Single End

70W

25W

36W

70W

25W

36W

70W

25W

70W

50W

21W

13W

35W

13W

35W

36W

35W

25W

2.2W

10W

25W

2.2W

21W

20W

25W

50W



Weight



4.5 kg

2.5 kg

4.6 kg

2.5 kg

4.6 kg

2.5 kg

4.6 kg

2.5 kg

4.5 kg

2.5 kg

4.5 kg

2.5 kg

4.6 kg

2.5 kg

0.75 kg

1.4 kg

2.5 kg

0.75 kg

2.5 kg

Transformer

type

LL1693

LL1627

LL2752

LL2768

LL1627

LL2752

LL2768

LL1627

LL2768

LL1623

LL2752

LL1627

LL1693

LL1627

LL1693

LL1679

LL2768

LL1623

LL2766

LL1664

LL1623

LL2766

LL2770

LL1623

LL1620



Con guration



3.1k : 5

3.1k : 8

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Primary

impedance

3.3k

4.5k

4.6k

4.7k

5.5k

5.6k

6.5k

9.2k

9.7k

10k

Audio transformers • Tube output transformers • Lundahl Transformers



Secondary

impedance

8Ω

16 Ω

4Ω

8Ω

16 Ω

8Ω

16 Ω

5Ω

5 and 8 Ω

8Ω

4Ω

5Ω

8Ω

16 Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

8Ω

4Ω

8Ω

16 Ω

8Ω

16 Ω

4Ω



Max power capability at 30

Hz, Push-Pull

250W

105W

45W

100W

40W

320W

40W

320W

62W

24W

125W

24W

125W

24W

125W

350W

250W

160W

45W

160W



Max power capability at 30

Hz, Single End

50W

20W

10W

20W

60W

13W

25W

50W

30W



Weight



2.5 kg

1.4 kg

4.0 kg

1.4 kg

4.0 kg

2.5 kg

0.75 kg

2.5 kg

0.75 kg

2.5 kg

0.75 kg

2.5 kg

4.6 kg

4.0 kg

2.5 kg

4.6 kg

Transformer

type

LL1620

LL1679

LL2752

LL2769

LL1663

LL1688

LL1682

LL1688

LL1623

LL2766

LL1620

LL2766

LL1620

LL2766

LL1620

LL9202

LL1691

LL1688

LL1679

LL1691D



Con guration



5Ω

5+8 (Elekit)

8Ω

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Primary

impedance

10k

11k

11.5k

16k

20k

23k

Audio transformers • Tube output transformers • Lundahl Transformers



Secondary

impedance

16 Ω

4Ω

8Ω

16 Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

4Ω

8Ω

16 Ω

8Ω

16 Ω



Max power capability at 30

Hz, Push-Pull

160W

125W

95W

125W

62W

160W

62W



Max power capability at 30

Hz, Single End

30W

25W

18W

25W

13W

30W

13W



Weight



4.6 kg

2.5 kg

4.6 kg

2.5 kg

1.4 kg

4.6 kg

2.5 kg

Transformer

type

LL1691D

LL9202

LL2755

LL9202

LL1620

LL2735F

LL2735B

LL2735F

LL1691E

LL1691B

LL1691E

LL9202



Con guration



Purchasing our products

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 to allow for (8% and

25%) cathode feedback connections.

The 2.5kg and the 1.4 kg transformers above are available with amorphous

iron C-cores.

We expect all application parameters to be similar

for the amorphous core and the silicon iron cores, except that the amorphous cores signal handling capability is slightly smaller.

From a purely engineering point of view, we cannot justify the fairly high price of our amorphous core OPTs. But we have actually received a lot of

praise for their sound quality, such as this

report.

When considering testing an amorphous core transformer, please note that they are said to require much longer break in time than what is

normally required for silicon-iron cores.

Lundahl Transformers

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Audio transformers • Tube output transformers • Lundahl Transformers.pdf (291 KB)

Audio transformers • Tube output transformers • Lundahl Transformers.pdf

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