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two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]]. | two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]]. | ||
The 556's bandwidth is 50MHz, whereas the 555's is 30. | The 556's bandwidth is 50MHz, whereas the 555's is 30. | ||
The 555 and 556 both use separate HV transformers for the lower beam and upper beam voltages. | |||
In both models, the lower beam HV transformer produces the CRT anode voltage. | |||
== Comparison with the 565 == | == Comparison with the 565 == |