Description

PLEASE, READ CAREFULLY EVERYTHING. IT IS IMPORTANT. About Item : The PCC84 double triode shows how valves developed to meet the needs of VHF television transmission. The PCC84 and PCF80 both featured in set-top converters for the new ITV television Band III channels that commenced broadcasting in 1955. The transmissions were on around 170 MHz and much higher in frequency than the BBC Band I signals at around 50 MHz. The PCC84 was specifically designed for cascode operation. The normal configuration was for triode one to be operated as a grounded cathode stage directly coupled to triode two. Triode two was connected as a grounded grid stage. The triode has a smaller inter electrode capacitance than a pentode at VHF and could be made physically small. The photograph shows that within the envelope the electrodes are a small percentage of the total volume. The two triodes would be used for initial signal amplification at up to 220 MHz. The low anode voltage and relatively high current being features to ensure low noise operation. The anode dissipation was two Watts for one triode or 2.5 Watts for both triodes operating. Identical to PCC84 = 7AN7 = 30L1 Similar Tubes Normally replaceable-slightly different: 8T27 ; B319 Heater different: UCC84 The thin glass tube envelope is 18 mm in diameter and, excluding the B9A base pins, is 45 mm tall. Weight: 20 g PLEASE, READ CAREFULLY! SHIPPING METHODS: 1. Europe - Economy International Shipping - no tracking number. If you wish faster delivery and tracking number, select STANDARD mail. 2. Worldwide - Standard International Shipping - with tracking number included in the cost of shipping. 3. All orders above $60 - with tracking number included in the cost of shipping. The delivery time varies from 7 to 45 working days (9 weeks) to most of the countries. Detailed info you can find in the table below. Delivery time % of shipments that arrive in the said delivery time Country working days (without holidays and weekends) <15 15-24 25-34 35-45 >45 <3 weeks 5 weeks 7 weeks 9 weeks >9 weeks Canada, United States 5 % 85 % 7 % 3 % 0 % Africa, South America 5 % 20 % 55 % 20 % 0 % Japan, South Korea 10 % 85 % 5 % 0 % 0 % Taiwan, Thailand 5 % 45 % 45 % 5 % 0 % China, India 5 % 40 % 50 % 5 % 0 % Indonesia, New Zealand 5 % 40 % 50 % 5 % 0 % Israel 5 % 65 % 30 % 0 % 0 % Australia 5 % 55 % 35 % 5 % 0 % Russia 5 % 50 % 40 % 5 % 0 % Europe 60 % 35 % 5 % 0 % 0 % Others, not entered shall, countries 5 % 20 % 55 % 20 % 0 % Items are generally shipped out within 24 (rarely 48) hours after payment has been confirmed (Holidays, Sat. & Sun. excluded). The delivery time depends on the destination, holidays, customs clearance factor and other factors. Please , if you have a problem , DO NOT OPEN CASE on eBay before this period has elapsed or before you communicate with us. We ship your package to your eBay address. Please update your complete address including full name and phone number during checkout. We are not responsible for any wrong or undeliverable address. INTERNATIONAL BUYERS – PLEASE NOTE: Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to bidding/buying. ADDITIONAL INFORMATION & QUESTIONS: The pictures are for general information only . They do not carry technical information . I apply maximum efforts to work better and better. It is very important for me to get your feedback to know, whether you are really satisfied completely! Please, contact us if you have questions - especislly in the delivery term. Please use the link "Ask seller a question". GUARANTEES & a POLICY of RETURN: We guarantee you complete satisfaction with all our products. If you receive an item you ordered damaged or defective, we will send replacement item. We only accept returns if the items in original package you have received are not what was described in the auction, damaged or defective. If exchange is not possible money refund will be issued. All returns must be sent to Bulgaria. Item for returning must have the original tags and packing, otherwise it won't be accepted. Thanks And Good luck! 100686 </