PAIR TUBES Hytron VT25 matched curves with Sofia NOS 10Y VT 62 801A tube

EUR 320,00 Compralo Subito o Proposta d'acquisto, EUR 10,00 Spedizione, 30-Giorno Restituzione, Garanzia cliente eBay
Venditore: brucknerhorn ✉️ (193) 100%, Luogo in cui si trova l'oggetto: Bologna, IT, Spedizione verso: WORLDWIDE, Numero oggetto: 186357508284 PAIR TUBES Hytron VT25 matched curves with Sofia NOS 10Y VT 62 801A tube. In the last century I bought a few thousand tubes and tested them with the computerized curve tracer Sofia by Audiomatica. The tubes I purchased were mostly direct heated triodes ( DHT ) and high transconductance noval. Over time I have kept only the most linear tubes and matched them. In the coming weeks a part of my collection will be on sale (among these DHTs such as UX201A, CX301A, 171A, 112A, CV1660, 3A/110A, AC/P4, 801A, 10Y, 801 RCA ceramic base, RE604 TFK globe, RE084, RE134, D3A Siemens, etc ) If you need information on the interpretation of the curves or enlargements of specific areas, just ask. It should be noted that Sofia's software makes an error when measuring direct heated tubes.The cathode reference point is lifted up by half of the heater voltage; so, for example, when the filament is fed at 4 volts, all curves are actually measured at 2 volts less than nominal. The curve you see at -40 volts is actually at -42 volts. The higher the voltage of the filament, the greater the difference (especially with the family of 10Y/VT25/VT62/801A etc with a 7.5 volt filament the error is 3.75 volts) You can read about it on the dedicated page in Sofia by Audiomatica on the Jac music website. Auction for one matched pair of Hytron VT25 NOS only tested ( my numbers no C1  and no C2) Full emission, same construction like 801A, please see images ) You see the curves of each  triode and the third image with the curves overlapped For any infos and for combined shipping, please ask. For shipping outside Europe, please ask for better prices
  • Condition: New, only tested
  • Quantità: 1 matched pair
  • Marca: Hytron
  • Modello: VT25
  • Paese di fabbricazione: Stati Uniti

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  •  Popolarità - 0 utenti che lo osservano, 0.0 nuovi utenti che lo osservano ogni giorno, 8 days for sale on eBay. 0 venduti, 1 disponibile.
  •  Miglior Prezzo -
  •  Venditore - 193+ oggetti venduti. 0% feedback negativo. Grande venditore con molto buone risposte positive e oltre 50 recensioni.

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