Just finished two phonostages with all directly heated triodes. Here some photos:
Both preamps share the same circuit which has already been presented here.
Also the internal construction is identical as shown here and here.
There is onlyone difference. The phono stage with the black covers uses a silver wound output transformer, the LL1660Ag.
Both preamps will be used with external MC step up transformers. Also the LCR RIAA will be in separate chassis.
Both preamps share the same sound character of all DHT amplification which has already been described here. The silver in the output transformer again make a remarkable difference. Stay tuned for a report on the sonic differences between the standard LL1660 and the silver version.