EB5AGV's Marconi 2955 2955A 2955B 2955R 2022 SPARE PARTS
Parts to fix your ailing 2955 or 2022 series test set
Welcome to my Marconi 2955 2955A 2955B 2955R 2022 SPARE PARTS page!
UPDATED 11-June-2020
Marconi 2955A
Philips OM Hybrid modules
Main problem with 2955 sets is the failure of one or more Philips OM series hybrid amplifiers which are now obsolete and hard to find. When they fail, you can get several problems, as low output power, lack of sensitivity and so on. Please, check my Marconi 2955A page for some info about OM modules location and related failures.
Another Marconi equipment which uses the same modules are the 2022 series generators.
OM modules used on each model are these:
Marconi 2955
- OM-345 or OM-2045 (4 units)
- OM-350 or OM-2050 (3 units)
- OM-360, OM-360L or OM-2060 (output power amplifier, 1 unit)
Marconi 2955A
- OM-345 or OM-2045 (4 units)
- OM-350 or OM-2050 (3 units)
- OM-370L (output power amplifier, 1 unit)
Marconi 2022
- OM-345
- OM-360 (output power amplifier)
OM-345 / OM-2045 REPLACEMENT MODULE PCB
New and Tested OM-345 OM-2045 Replacement module PCB for Marconi 2022, 2955 series and others. It has been developed by John Davis and I distribute them.
Specification is not the same but similar to the OM-345 / OM-2045. It uses a MMIC RF Amplifier (50 Ohm) and two resistors in parallel to give the 12mA bias current and about 13dB in gain.
Dimensions of PCB are 13 x 8 x 1mm . Pin 1 ID is on the copper layer, not the silkscreen ,so it will not rub off.
No modifications are needed, but the unit may require recalibration.
These modules with MMIC RF amplifier are renowned for being very reliable.
A tech note will be included (in digital format) with every order.
Any questions, please ask.
Next picture shows modules fitted on a Marconi 2022C (AB1-2 PCB):
FLYBACK (Line OutPut Transformer LOPT) KITS
These kits are comprised of a new flyback transformer (with improved specifications), an adaptor PCB to exactly fit old flyback pattern, a couple improved components and detailed instructions (sent by e-mail) to install the kit. These are clones of the Marconi designed kits and have been used successfully in several units.
IMPORTANT
There are two Kits available, referenced as Kit #1 and Kit #2.
Flyback Kit #1
is used to replace blue or black transformers and it is the most common.
Flyback Kit #1 - v2 version (replaced by v3)
Flyback Kit #1 - NEW v3 VERSION (improved PCB, includes other parts shown in previous picture)
Kit #1 replaces the following flybacks:
Flyback Kit #2
replaces the red Sarea brand transformer, and includes some extra Marconi custom-made hardware parts:
Flyback Kit #2
Kit #2 replaces the following flyback:
NOTE: Instructions to fit the Kits will be provided by e-mail
IMPORTANT: in case you order a flyback kit, it is necessary to check wich transformer you are going to replace to select the correct kit. If in doubt, please, send me a picture of the unit you are going to replace. E-mail me if you have any question.
IMPORTANT: These flybacks are of the right type; in the picture you can see that there are similar ones, but with cable output in vertical. They are not physically compatible and need some mechanical work to make them barely fit in a 2955. So be sure to get the correct one, which is plug and play (note that cable color is irrelevant)
Available parts
| Type | Price (EUR) | Availability |
| OM-345 / OM-2045 REPLACEMENT MODULE PCB | OUT OF STOCK | |
| Input DUMMY LOAD | OUT OF STOCK | |
| OM-345 | OUT OF STOCK - see REPLACEMENT PCB | |
| OM-350 | OUT OF STOCK | |
| OM-360 | AVAILABLE | |
| OM-360L | OUT OF STOCK (see OM-360) | |
| OM-370L | FEW AVAILABLE | |
| OM-2045 (upgraded OM-345) | OUT OF STOCK - see REPLACEMENT PCB | |
| OM-2050 (upgraded OM-350) | OUT OF STOCK | |
| OM-2060 (upgraded OM-360L) | OUT OF STOCK | |
| Flyback Kit #1 (v3) | OUT OF STOCK | |
| Flyback Kit #2 | OUT OF STOCK | |
| Keypad switch | AVAILABLE |
Ordering parts
You can easily buy parts by PayPal:
Select the items you need adding them to your cart by clicking on the appropriate buttom below.
Click on view cart to modify its contents or proceed to checkout.
Shipping and handling worldwide by Registered Mail (a track number is provided) is calculated by PayPal shopping cart, depending on total amount. It goes from 7 to 15 EUR
Please, e-mail me if you want to use other ways for payment, as SWIFT transfer or cash.
Philips OM-360 hybrids
Philips OM-370L hybrids
Keypad switches
Contact information
Hope this helps to fix some non working 2955s!
You can contact me at eb5agv@amsat.org for more information or questions.
Go back to Main Marconi 2955A Page
Keywords: Marconi 2955 2955A 2955B 2955R Philips OM-2045 OM-2050 OM-345 OM-350 OM-2060 OM-360 OM-360L OM-370 OM-370L OM345 OM2045 OM2050 OM350 OM360 OM360L OM370 OM370L keyswitch switch keypad CRT picture tube display assemblies PCB PCBs 2022 2022A 2022D 2022E