Every GE Speedtronic circuit board carries its generation in the first few characters of its part number. If you can read that prefix, you can tell in seconds whether a board belongs in a Mark IV panel or a Mark VI rack — and avoid ordering a card that will never seat in your system.
The prefix tells you the Mark generation
| Prefix | Turbine control system | Browse |
|---|---|---|
| IC3600 / IC3606 | Speedtronic Mark I and Mark II — analog and discrete-logic cards | Mark I-II cards |
| DS3800 / DS3820 | Speedtronic Mark IV — early microprocessor control | Mark IV boards |
| DS200 | Speedtronic Mark V — triple-redundant (TMR) control | Mark V boards |
| IS200 / IS210 / IS215 / IS220 | Speedtronic Mark VI — VME-based control | Mark VI boards |
| IS400 / IS420 | Speedtronic Mark VIe and VIeS — current platform | Mark VIe boards |
This mapping is the single most useful thing to know about GE turbine control spares. A DS3800DSQD sequencer auxiliary board is a Mark IV part. A DS200CSSAG1A cell state sensor is a Mark V part. They are not interchangeable, and no adapter makes them so.
Browse everything in one place: all GE Speedtronic turbine control boards.
Anatomy of a DS200 / IS200 part number
Take DS200TCQAG1BED and break it apart:
- DS200 — the family. Mark V.
- TCQA — the functional acronym. This is what the board actually does; in this case the main analog I/O card. See our guide to the Mark V board acronyms.
- G1 — the group / style code. G1 denotes a group-one style of board with the normal grade of protective PCB coating. An H-style code in the same position indicates the heavier conformal coating used in harsher environments.
- BED — the revision tail. Each additional letter tracks a functional revision applied to the board design.
That last part is where most ordering mistakes happen, so it deserves its own section.
Why G1A and G1AAA are not the same thing
Suppliers list the same physical board under a short number and a long number, and buyers assume one is a typo. They are not. The short form (for example DS200CSSAG1A) is the base catalogue number. The long form (DS200CSSAG1AAA) carries the revision letters that identify exactly which iteration of that board you are holding.
Practical consequence: a later revision will normally drop into a slot that held an earlier one, but the reverse is not always true, and firmware or jumper expectations can differ. If your existing card is a G1AAA and you are quoted a G1A with no revision tail, ask which revision is physically in the box before you buy.
This is also why you will see both numbers on the same listing — for instance our DS200GDPAG1A / DS200GDPAG1AFB gate driver board. The first is the family number, the second is the specific revision on the shelf.
Where to find the number on the board
On DS200 and IS200 cards the part number is silkscreened on the PCB itself, usually near an edge, and repeated on a paper or foil label. On older IC3600 and IC3606 cards the number is often stamped on the card edge or on the ejector tab. Read the number off the board, not off the slot label in the cabinet — cabinet labels record what was originally installed, not necessarily what someone fitted during the last outage.
If the silkscreen is unreadable, photograph the board and send the picture. Component layout and connector arrangement are usually enough for us to identify the family.
What to send when you request a quote
- The full part number, including the revision tail — DS200TCQAG1BED, not just TCQA.
- The Mark generation and unit — and for Mark VI, whether the panel is TMR or simplex.
- Which core or slot the board sits in — R, S, T, Q or C on a Mark V; the rack and slot on a Mark VI.
- Condition you will accept — new surplus, open box, or tested used. Many of these boards have been out of production for years and the honest answer is that new-in-box may simply not exist.
- Quantity and whether you need a spare on the shelf — single-card replacements and full TMR sets are priced very differently.
- Whether you can accept a superseding revision — this frequently turns a twelve-week hunt into a same-week shipment.
We reply to quote requests within 24 hours, ship worldwide DDP, and accept purchase orders.