Dagnall and Drake OT Specifications

[roberto]

Hi all,
I'm collecting some info about power and output transformers on different amps because I've found a trafo maker near me and this will let me save some money so try different configurations on my hi-gain marshallesque amps (for an example, you can google Marsholdano for schematics and all).


By now I've found some Dagnall specifications:

Dagnall C1998 38x38mm on EI M6 core:
- 16-0 ohm secondary (parallel): 120 turns x 0.76mm AWG21
- primary: 2 x 620 turns on eight layers x 0.45mm AWG26
- 8-16 ohm secondary: 35 turns x 1.18mm AWG18
- 4-8 ohm secondary: 25 turns x 1.18mm AWG18
- 0-4 ohm secondary: 60 turns x 1.60mm AWG15

Dagnall C2668 on 38x40mm on EI M6 core (500-650pF primary to secondary capacitance):
- 0-4 ohm secondary: 60 turns x 1.76mm AWG13
- 1/2 primary: 620 turns on four layers x 0.45mm AWG26
- 4-8-16 ohm secondary: 25+35 turns x 1.18mm AWG18
- 1/2 primary: 620 turns on four layers x 0.45mm AWG26
- 0-16 ohm parallel secondary: 120 turns on two layers x 0.75mm AWG21

Dagnall C3070 32x60mm on EI M6 core:
- 1/4 primary: 310 turns on two layers x 0.45mm AWG26 (B+ to half A2)
- 0-2 ohm secondary: 40 turns x 1.76mm AWG13
- 1/2 primary: 620 turns on four layers x 0.45mm AWG26 (B+ to A1)
- 2-4 ohm secondary: 20 turns x 1.76mm AWG13
- 4-8 ohm secondary: 25 turns x 1.18mm AWG18
- 8-16 ohm secondary: 35 turns x 1.18mm AWG18
- 1/4 primary: 310 turns on two layers x 0.45mm AWG26 (half A2 to A2)

Drake 1202-84 (11/65)
2" core - 4K primary - 8 and 16 ohm secondary

Drake 1202-119 (02/67)
2" core - 1.75k primary - 8 and 16 ohm secondary

Drake 1202-132 (06/67)
2" core - 1.75k primary - 4, 8 and 16 ohm secondary

Do you have any more informations?

[roberto]

Some more specs for C2668

Replacement Dagnall C2668 OT for a 1978 2203.pdf

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