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Swapped out the 1000pf in the tone stack with the 220pf (NOS Mallory polystyrene similar to original) and while at it, put the V1 Brilliant channel cathode back to stock with a Mullard 47n and Iskra 2.2k. For the most part when A/B'ing to my friend's original stock, now they're really close, other t...

Well I've replaced the power supply caps with ARS brand, who offer the closest to matching vintage values I was able to find. 500V as well which is better. Tightened up the tone a little, but honestly, otherwise not a significant tonal difference from what I recall. So apparently the original caps m...

Thank you Mark! A pleasure to make your acquaintance here and appreciate your response. Exactly the input I had hoped for. You are correct, Hiwatt's are brighter than I had perceived from the recordings I related them to. Which to a degree could also related to hearing them thru proper Hiwatt cab's ...

Hey Y'all - I'm new to posting here on VHC. I've been a fan of Hiwatt's forever, used to own a '71 Hiwatt DR103 and just recently purchased a '77 4-input DR504, the Hiwatt that has eluded me for a long time. Love it. Thought this particular amp was an original untouched circuit, but discovered it ha...