TRANSFORMERS FOR TUBE PREAMPLIFIERS
(INTERSTAGE)
Attention! There is a high voltage!
Observe safety arrangements by operation with a high voltage!
In all interstage transformers sectioning is applied for reaching of as much as possible wide pass-band.
Each transformer passes primary heat treatment in a current of 24 hours in thermocases and vacuum impregnation by a varnish in primary sort.
For a bandage couplers from not magnetic materials are used.
Standard multi-coloured outputs of transformers (length 15 - 20 cm)
can be used directly in point-to-point application.
Differ in pairs of transformers no more than 5 % on all measured parametres.
We offer interstage transformers potted into black boxes of black colour (powder colouring) or not potted.
Manufacturing of interstage transformers under the individual technical specification is possible.
"Golden Middle" reserves the right to make product changes without affecting the technical specifications.
All transformers have a limited warranty according technical specifications
during 12 months from the date of receiving.
POT - IS - 5 / 5
Ra /Rí 5 KOhm / 5 KOhm 1 : 1
potted into black boxes
TECHNICAL SPECIFICATIONS :
Case dimensions : 75 mm x 85 mm x H 95 mm
The adjusting sizes : 4 õ M3 55 mm õ 65 mm
Inductance : 25 H ( max DCI = 60 mA )
The maximum DC operation voltage : 1000 V
Frequency range of 10 V : 10 Hz - 30 KHz
It is recommended to use with following vacuum tubes :
4P1L,
6F6S / 6F6 (in triode),
6S4S / 2S4S / 2A3,
300B,
6P3S / 6L6 (in triode),
EL86,
6P14P / EL84 / 6BQ5,
6S9P,
6P14P / EL84 / 6BQ5 (in triode)
Transformer circuit diagram 
POT - ISHP - 3 / 300
OT - ISHP - 3 / 300
3 KOhm / 300 Ohm
potted into black boxes not potted
TECHNICAL SPECIFICATIONS :
Case dimensions : 75 mm x 85 mmm x H 95 mm (for the potted item)
The adjusting sizes : 4 õ M3 55 mm õ 65 mm (for the potted item)
Inductance : 25 H ( max DCI = 80 mA )
The maximum DC operation voltage : 1000 V
Maximum primary AC voltage : 200 V (50 Hz)
Frequency range of 10 V : 10 Hz - 30 KHz
It is recommended to use with following vacuum tubes :
4P1L,
6F6S / 6F6,
6P14P /
EL84 / 6BQ5 (in triode),
6S19P,
6P3S / 6L6 (in triode)
Transformer circuit diagram
POT - ISPP - 3 / 3 / 3
3 KOhm / 2 x 3 KOhm
(3 KOhm : 3 KOhm : 3 KOhm without DC current)
potted into black boxes
TECHNICAL SPECIFICATIONS :
Toroidal core
Case dimensions : 90 mm x 90 mm x H 60 m
The adjusting sizes : 4 õ M3 75 mm õ 75 mm
Inductance : 20 H
The maximum DC operation voltage : 500 V
Maximum primary AC voltage : 200 V (50 Hz)
Frequency range of 10 V : 15 Hz - 25 KHz
It is recommended to use with following vacuum tubes :
6S15P,
6S45P-E,
6N6P,
6S19P,
6S4S / 2S4S / 2A3
Transformer circuit diagram
POT - HP - 2,5 / 30
2,5 KOhm / 30 Ohm
potted into black boxes
TECHNICAL SPECIFICATIONS :
Case dimensions : 60 mm x 65 mm x H 65 mm
The adjusting sizes : 4 õ M3 45 mm õ 50 mm
Inductance : 10 H ( max DCI = 55 mA )
The maximum DC operation voltage : 500 V
Maximum primary AC voltage : 60 V (50 Hz)
Frequency range of 10 V : 25 Hz - 30 KHz
It is recommended to use with following vacuum tubes :
EL86,
6P15P (in triode), 6S15P,
6S45P-E,
6S19P
Transformer circuit diagram
POT - PPHP - 3,0 / 30
Ra-a 3 KOhm / Rh 30 Ohm
(without DC current)
potted into black boxes
TECHNICAL SPECIFICATIONS :
Toroidal core
Case dimensions : 90 mm x 90 mm x H 60 mm
The adjusting sizes : 4 õ M3 75 mm õ 75 mm
Inductance : 23 H
The maximum DC operation voltage : 500 V
Maximum primary AC voltage plate - to - plate: 200 B (50 Hz)
Frequency range of 10 V : 15 Hz - 22 KHz
It is recommended to use with following vacuum tubes :
2 x 6S15P,
2 x 6S45P-E,
2 x 6N6P,
2 x 6S19P,
2 x 6Í30Ï, 2 x 4P1L (in triode)
Transformer circuit diagram
POT - PRE - 5 / 30 / 300 / 600 / 3000
PT - PRE - 5 / 30 / 300 / 600 / 3000
Ra 5 KOhm / Rí 30 - 3000 Ohm for preamplifier for head-phones
4 variants of primary commutation are possible
potted into black boxes not potted
TECHNICAL SPECIFICATIONS :
Case dimensions : 60 mm x 65 mm x H 90 mm (for the potted item)
The adjusting sizes : 4 õ M3 40 mm õ 45 mm (for the potted item)
Dimensions : 55 mm x 55 mm x H 90 mm (for the not potted item)
Inductance : 20 H ( max DCI = 55 mA )
The maximum DC operation voltage : 1000 V
Maximum primary AC voltage plate - to - plate: 150 B (50 Hz)
Frequency range of 10 V : 15 Hz - 45 KHz
It is recommended to use with following vacuum tubes :
6S15P, EL86,
4P1L,
6S45P-E,
2 x 6N6P,
6N30P-DR, 2 x 6P15P (in triode)
Transformer circuit diagram
