Grommes G-50 Precision Tube Amplifier
Archived listing from the original vintage-amplifier.com. Prices, seller details and purchase links have been removed; this page is a reference record, and nothing here is for sale. About this archive.
Ultra rare Grommes Precision Model G 50 tube amplifier. Caps/resistors and any part needing replacing, or updating has been performed by a qualified tech. Tung Sol 6550’s and clear top rca preamp tubes are included 🙂 Massive transformers and brute PP force make for an awesome tube amp.
About this model
The seller called this G-50 ultra rare and noted it had been gone through by a qualified technician, with capacitors, resistors and any other worn parts replaced. It came with Tung-Sol 6550 output tubes and clear-top RCA preamp tubes.
The 6550 is a large American beam tetrode, often compared with the British KT88, which has higher ratings. A push-pull pair of tubes in that class puts the G-50 among the more powerful Grommes amplifiers; the model number suggests 50 watts, though the surviving listing does not state the rating.
| Maker | Grommes-Precision Electronics, Illinois, USA |
|---|---|
| Type | Power amplifier |
| Output tubes | Tung-Sol 6550, push-pull (listing) |
| Service noted | Capacitors and resistors replaced (listing) |
Questions collectors ask
What output tubes does the Grommes G-50 use?
This archived example had Tung-Sol 6550 output tubes in push-pull.
Is a 6550 the same as a KT88?
They are often used as substitutes, but Wikipedia notes that the KT88 has higher plate power and voltage ratings than the 6550. Check the amplifier's bias and voltages before swapping.
Sources: Wikipedia: KT88.
